Balancing Li-Po battery packs

When talking about balancing Li-Po battery packs, we’re not talking about finding their correct Centre of Gravity! Instead, the balance refers to the voltage of each cell in a pack relative to the other cells.

LiPo Battery balancingBalancing is required however on any RC LiPo battery pack that has more than one cell since the charger can’t identify from different cells and know if one might be overcharged even though the total voltage of the pack indicates otherwise. For example let’s look at a 2200mah 3s 11.1v 30c lipo pack (three LiPo cells hooked in series or 3S). A two cell is equal to 7.4v lipo pack, a three cell is eqaul to 11.1 volt pack - and so on.

How long it takes to balance charge is going to depend on how deeply you discharge it. The GT Power A6 is a 50 watt charger, on 4S the max rate it will charge is roughly 3.3 amps at the beginning with a completely discharged pack, and go down to 3.0 amps as it approaches full. As any of these CC/CV chargers reach the end of the charge the voltage drops to a constant level and the amperage is reduced as it tops off the cells, and usually balances them at this time as well. The following we mainy talk about the 5000mah lipo battery balanced.

Let’s say you had completely discharged 5000mah 14.8v lipo, charging at an average of 3 amps, this is roughly a 6/10C charge. That charge rate would take 1 hour and 40 minutes just to replace the 5000mah, but, will take slightly longer as the charge rate slows at the end, and the cells are balanced. Assuming it’s a good pack, 1 hour and 50-55 minute would be a good estimate. The reality is, you don’t ever want to be putting 5000mah back in, rather 4000mah. That would mean you aren’t discharging more than 80% out of the pack. That would drop your charge time for that pack down to 1 hour and 20 min in theory, but more like 1 hour 30-35 min after the CV phase and balance finishes.

On the other end of the spectrum is if there is one cell in the pack that is not reaching full charge when the pack is charged and then gets discharged below 3.0 volts under load even though the 3 cell battery pack is indicating a voltage of 9 volts or higher.

Balancing ensures all cells are always within about 0.01-0.03 volts per cell so over charging or discharging of one or more cells won’t ruin your battery pack, or worse become a safety issue from overcharging a cell.

You don’t have to balance your RC LiPo battery pack each time you charge it. Most will agree every 10th to 20th time is fine with a healthy battery pack. The problem is knowing if your pack is healthy, cells in older packs may become unstable? As far as I am concerned, if you have a good balancer or balancing charger, use it at every charge, or at least at every 2nd charge. That might be overkill, but if it prevents a damaged battery or fire just once… well, you decide.

Balancing Li-Po battery packs should be done regularly and you should get in to the habit of checking the balance often. A poorly balanced pack will give poor performance, and in the worst case scenario will be damaged beyond repair over time. It’s also important to understand that lithium polymer battery packs vary greatly in quality between brands, and it stands to reason that a better quality pack will probably balance better and stay balanced longer than a cheaper, lower quality one. Mentioned Lipo battery brands, here we can talk about Gens Ace lipo battery, they are the famous brand manufacturer in the world, choose Gens ace for you car, it is the right choice.

The Characteristics of Li-Ion/Polymer Battery

The nominal voltage of a Li-Po battery cell is 3.7V (about 4.23 V when fully charged). Two and three cell batteries are available giving us a choice of 7.4 or 11.1 volts. Li-Po batteries can provide substantial current, 6A continuously and 12A for short (30-second) bursts. Li-Po cells have a flexible, foil-type (polymer laminate) case. Since no metal battery cell casing is required, Li-Po batteries are very light. Because of the absence of metal casing and less space utilized in intercell spacing, the energy density of Li-Po batteries is over 20% higher than that of a classical Li-ion battery and store more energy than nickel-cadmium (NiCd) and nickel metal hydride (NiMH) batteries of the same volume.

Care must be drawn in using Li-Po batteries. Their capability to provide high burst currents, lack of a rigid case, and overcharging sensitivity presents both electrical and thermal hazards. Intelligent chargers designed specifically for Li-Po batteries must be used to recharge these batteries. Overcharging a Li-Po battery will likely lead to explosion and/or fire. Li-Po cells must not be discharged below 2.75V per cell, or else the 7.4v 2200mah lipo battery will subsequently no longer accept a full charge and may experience problems holding voltage under load.

Very little battery performance data seems to exist regarding the current generation of low-cost Li-Po batteries. Since we were unable to locate discharge or charge rate charts for the batteries, we decided to perform our own characterization.

Since lithium polymer (and lithium ion) are so sensitive to overcharging, the individual cells that make up the 5000mah lipo 2s pack are charged independently. With NiCad and NiMH packs, the standard charging method is to apply a voltage and current across the series-connected cells so that the same current passes through each cell. The voltage across the entire pack is the sum of the individual cells voltages, but the cell voltages are not necessarily all equal. In fact, it is almost certain that they are not. Since nickel-based cells are relatively tolerant of some overcharging, there is usually no danger. It is not uncommon for one cell in a NiCad or NiMH battery pack to be dead, and yet the rest of the cells charge normally. What that means is in the case of an 8-cell pack, with the nominal voltage of each cell being 1.2 V (9.6 V total), if a charging voltage of 10.4 V is present, each cell would ideally receive 10.4 / 8 V = 1.3 V. If one cell is dead, however, the voltage across each cell would be 10.4 / 7 V = 1.5 V. That 15% increase can be handled by most NiCad and NiMH cells, but a 15% overvoltage applied to a lithium cells would eventually result in a failure, and likely a fire. Li-Po batteries are also intolerant of over discharging, and tend to die if discharged below around 2.5 V. In operation, controller circuitry should prevent the cell voltage from dropping below 3.0 V. Cell temperature should never exceed 90 °C in order to prevent the internal separator polymers from melting and allowing plate shorting through physical contact.

To the left is my Mini Pulse XT aerobatic airplane. It uses the 450 motor and a 3 cell , 11.1 V, 2100 mAh, Li-Po battery. Futaba 4-channel radio.

Early lithium batteries had a rather high internal resistance, and had rather low discharge rates. As with all technology that is doggedly pursued, significant improvements have been made to the point that the contemporary Li-Po batteries may be substituted in most systems for the original NiCad or NiMH batteries. Discharge rates of 20C or 25C are commonly available on the commercial market. You can find 20C on google, there are Gens ace 20C 2000mah lipo, Gens 25C lipo battery in the market. In battery discharge terminology, each “C” is a discharge current equivalent to the value of the energy capacity of the cell (it is not the abbreviation for the Celsius degree unit). In the case of a 1,200 mAh rating, 1C is equal to a discharge current of 1,200 mA, or 1.2 amps. A 10C cell can deliver a continuous current to a load of 10 x 1.2 A = 12 A during its discharge cycle. The E-flight 450 motor shown to the right would require atleast a 12C battery to deliver full rated power. This motor, by the way, is the one I use in my electric-powered sailplane (2-meter wingspan) and in my 4-channel aerobatic airplane (an E-flight Mini Pulse XT).

In my opinion, Lipo batteries are grossly overpriced, given the huge production volumes in effect. When you consider that almost every mobile electronic device and cordless power tool uses these batteries, the cost should be a lot lower. Maybe it is partially product liability insurance that manufacturers have to purchase that keeps the prices high, but I just paid $50 each for two 3-cell (11.1 V), 2,100 mAh packs. That is at least 2x to 3x what is should be costing at this point in the lithium cell evolution.

What is the capacity of 6-cell battery

What the hobby/RC world calls a “6S” battery is six lithium-ion (typically Lithium Polymer, or “LiPo”) cells, wired in Series, then packaged together with a 7-pin balance charging connector that allows a charger to sense/charge each cell individually, along with a fat 2-pin connector (often XT60 format) that delivers the series output of the battery as a whole.

What is an amp-hour?

An amp is a measure of electrical current, and the hour indicates the length of time that the battery can supply this current. A 2.2Ah 7.4v lipo battery 5000mah can supply 2.2 amps for an hour. If the battery must supply more amps, because a bigger device is connected, it will last for a shorter period of time; if the battery is supplying less amps, it will last longer. The problem with this method is that it doesn’t give a complete picture of the total energy stored. It is easy to find cases where two different batteries with the same number of amp-hours will have completely different amounts of total energy.

What is the difference between watt-hours (Wh) and amp-hours (Ah)?
The equation for power is
watts = amps x volts
and for energy the equation is
watt-hours = amp-hours x volts

What if I don’t have watt-hours?

3.7V per lithium-ion cell (RCs use a single cell (3.7V), laptops typically use 3 cells in series (11.1V)
3.2V per lithium-ion iron phosphate cell (multi-cell LiFePO packs are typically configured as 4-cell or 12.8V)
1.5V per alkaline cell
1.2V per NiMH and NiCad cell
2.1V per lead-acid cell (car batteries are 6-cell (12.6V) and some golf carts are 3-cell (6.3V))

The capacity of the battery, in milli-Amp hours (mAh) is usually its most prominent rating, but there are a few other interesting numbers. For an example, let’s use the cheapest 6S LiPo battery on Gens Ace at the moment: B-Grade 3000mAh 6S 20C Lipoly Battery

3000 mAh is the capacity, the nominal total amount of energy stored in the cells in milli-Amp hours.
22.2V is 3.7V (nominal voltage per cell at 80% capacity) × 6. You would expect to see higher resting voltage at a full charge (around 4.2V per cell), and lower under load. You should never go under 3.0V per cell under load (i.e. 18V for the whole pack), you can permanently damage the cells.
“20C” discharge rate means it’s rated for discharge at 20× the capacity normalized to 1 hour to full charge. So, if you were charging at 3A gens ace 2s lipo for one hour to reach full capacity, you could discharge at 20× that, or 60A. Keep in mind that 60 amps is a lot of current!
“5C” charge rate means you can charge it at 5× the current indicated by a full discharge in 1 hour. So, it should be safe to charge at 15A (3A capacity, times the “C” rating of 5)

Gens Ace Lipo Battery Guide

Gens Ace Lipo batteries are intended for use with radio controlled models only. R/C applications vary too greatly to cover every possible use in these instructions. The user must accept the duty to make smart and safe decisions about their desired application to avoid possible abuse and misuse. Non-R/C uses are not intended nor approved.

fpv gens ace Gens Ace from Genstattu

By purchasing our RC gens ace 4s you agree that you have read and understood the safety precautions printed here and on each product, and agree to bear full responsibility for any injury, loss or damage resulting from all circumstances surrounding your use or misuse of this product. You agree not to hold TrakPower, its distributors (owners and employees) and/or retailers responsible for any accidents, injury to persons, or property damage. You accept the responsibility for inspecting and detecting any signs of damage or defect before and after use and prior to charging and to discontinue use immediately if any such issue arises. If you do not agree to these terms of use, return the item in its original condition to the place of purchase.
LiPo batteries can be damaged and CATCH FIRE if overcharged, shorted, damaged physically, or over-discharged

Over-charging, using an incompatible charger, or charging a 2s 5000mah lipo that was previously damaged either physically or electrically can result in a catastrophic failure of the battery in the form of swelling, emission of smoke, and FIRE.
Over-discharging a LiPo (to a voltage lower than its rated minimum voltage) can damage a LiPo internally – even without the damage being visible in any way. Yet, a catastrophic failure (FIRE) could occur when attempting to re-charge the battery later.
LiPo failures are often a result of human error. Reading and understanding these instructions is CRUCIAL for avoiding problems, and to ensure personal safety and the protection of the surroundings.

CAPACITY: A way to rate a battery’s maximum energy storage limit, typically listed in “mAh” (milliamp-hours) and being the amount of energy the battery can deliver constantly over a period of one hour. Capacity rating is typically a way to gauge how much run time a battery can provide. The greater the rated capacity, the longer the run time.

C-RATING: A multiple of the battery’s capacity rating, calculated as the battery’s rated milliamp-hours (mAh) divided by 1000. C-ratings are used to establish various limits for a LiPo battery, such as a battery’s maximum charge and discharge current values. A battery rated at 2100mAh (1C = 2.1A) with a maximum charge rating of 3C could be charged at (2.1A x 3) 6.3 amps. A battery rated at 3200mAh with a maximum discharge rating of “25C” should be able to deliver(3.2A x 25) 80 amps of current during discharge.

SERIES PACK CONFIGURATIONS “S”: Electrically connecting multiple cells end-to-end places cells in “series”, with the resulting total pack voltage being the SUM of all cell voltages. Connecting packs in series is usually done to deliver more power (torque and/or speed) to the motor. A 3-series LiPo pack (3S) would have a total nominal voltage of (3 x 3.7V) 11.1V. A 4S pack has a total nominal pack voltage of (4 x 3.7V) 14.8V, etc. Connecting an 11.1V battery in serieswith a 7.4V battery will result in an overall voltage of 18.5V. Do not connect multiple packs together in series unless each has the same rated capacity (regardless of the rated voltage of each pack).

Gens Ace established in Year 1998 and mainly focus on mobile phone chargers and mobile phone batteries, Rechargeable batteries of Lithium Polymer (Li-po), Nickel Metal Hydride (Ni-MH) and LiFePO4 batteries, which used for various application, such as RC Models/Helicopter/Airplane/Boats/Cars, RC Toys and Power Tools, solar lighting, emerging lighting, cordless phone, walkie talkie, blue tooth, etc.

Tricks Standard battery voltages

Lithium polymer batteries are light and powerful, but they can’t be run completely flat or they are ruined. I’ve been using them for several years to fly model planes, so I have plenty of them around. I’ve also been using them at Raspberry Jam meetings to power some of my Pi demos.

The main “issue” with this measurement is that the ADC can only handle up to 3.3 Volts (when connected to Pi). A 2 cell lithium polymer (lipo) RC car battery pack is 8.4V when fully charged and 7.4V when empty (resting Voltage). So we need a way of dropping the voltage from 8.4V to something at or below 3.3V. The cheapest and easiest way to do this is with a voltage divider – essentially two resistors connected across the supply you want to measure. The resistor values are chosen so that the meaured voltage can be divided down to the required level.

Lipo chart

Depending on the design and chemistry of your lithium cell, you may see them sold under different nominal “voltages”. For example, almost all lithium polymer batteries are 3.7V or 4.2V batteries. What this means is that the maximum voltage of the cell is 4.2v and that the “nominal” (average) voltage is 3.7V. The following is the battery voltages:

1.2V: one rechargeable NiMh AA or AAA battery (unless you want a really small robot, one cell does not do much)
1.5V: one Alkaline AA or AAA battery(disadvantage of not being rechargeable and can’t do much on its own)
2.4v: two rechargeable AA or AAA batteries; still can’t do much on their own, even for small robots
3V: two alkaline AA or AAA batteries; most microcontrollers cannot operate at this voltage, let alone most actuators.
3.6V: three rechargeable NiMh AA or AAA batteries; this is usually the minimum voltage to run certain microcontrollers
3.7V: one LiPo battery; this is close enough to 3.6V and is the minimum to run certain microcontrollers
4.5V: three alkaline AA or AAA batteries. why even consider non-rechargeable in robotics?
4.8V: four AA or AAA together provide the minimum voltage to operate a standard hobby servo motor. These can be either as individual cells or as a single rechargeable battery pack.
6V: four AA or AAA alkaline batteries, five rechargeable NiMh cells or one 6V rechargeable lead acid pack; this is the maximum (and ideal) voltage most hobby servos can handle. Use these if your servos need a bit more power.
7.2V: six AA or AAA rechargeable NiMh batteries is perfect for 7.2V DC gear motors. These are usually in a battery pack rather than as individual cells and you will need a more specific NiMh battery pack charger.
7.4V: two LiPo cells can often power a microcontroller and works great for 7.2V DC gear motors. Unfortunately it’s too high for most hobby servo motors.
7.5V: five alkaline AA or AAA: almost never used because it’s simply too many single-use batteries.
8.4V: 7x NiMh AA batteries (hard to find chargers for 7xAAA NiMh batteries). This is also not used much because it means charging 7 batteries at the same time.
9V: 6x Alkaline batteries, one 9V (NiMh or Alkaline) battery or one 9V lead acid batteru: please avoid using 6x alkaline for the sake of the environment. A 9V single cell rectangular battery is often used to power the microcontroller in dual battery configurations. 9V lead acid batteries are a bit harder to find and although they are quite heavy, are fairly inexpensive and high capacity.
9.6V: 7x NiMh cells, usually in a battery pack configuration. This is good for motors which operate at 9V, and also for microcontrollers (most can operate above 9V).
11.1V: three LiPo batteries 5000mah lipo 2s produces almost 12V and is much lighter than 10x 1.2V cells or a 12V lead acid battery pack. You need a specific LiPo charger capable of charging 3 cell LiPo packs.
12V: 10x 1.2V cells (always configured as one NiMh battery pack) or one 12V rechargeable lead acid battery pack. 12V is ideal for a variety of DC gear motors and most microcontrollers.
Anything above 12V is usually reserved for very large robots. If you have a 14.4V LiPo or 18V NiMh pack from a cordless drill, keep in mind that finding motors which operate at these voltages is not easy.

Robots using servo motors (legged robots or robotic arms) tend to operate at 4.8V (4x AA NiMh cells) or 6V (5x NiMh AA cells). You can use a fairly inexpensive voltage regulator to power the microcontroller, increasing the voltage from 6V to 9V

Nowadays you may also be able to purchase 3.7v cells! These are the latest chemistry, they have a little more power as indicated by the voltage being higher than 4.2V. They tend to be cylinder lithium ion’s used for laptop batteries, and lights so its not terribly likely you’ll just run into one unless you’re looking for it.

Make sure when you’re buying batteries and chargers to match them up! Overcharging a 3.6V battery by attaching it to a 4.2V battery charger can at the very least permanently damage your battery and at worst cause a fire!

How to Choose between 1S, 2S and 3S LiPos For a multirotor copter

As a concrete example: according to the product description page I found for MT 1306 motors, it will run on either 1S lipo battery or 2S 7.4v lipo. So, which voltage will provide the best value in terms of optimal AUW and flight time (without compromising maneuverability)?

The manufacturer told me in an email that, with a 3 blade 5″ propeller, the AUW ought to be:

The AUW for quad should be around 400-520 grams.
The AUW for hex should be around 600-780 grams
The AUW for octo should be around 800-1040 grams.

In the beginners guide sticky at the top of the multirotors forum, Balu has this to say:

“What kind of lipo batteries for RC cars you need depends a lot of your multirotor model, how you want to fly and the motors you use. But a beginner should follow this little tip: 4S 11.1v lipo battery powered multirotors are for the experts. 3S lipo battery setups are for everyone else.

3s lipo battery makes it very fast and will result in some broken parts for sure. 2s is a tamer setup but still has plenty of oomph. Look on the traxxas website bumps up the top speed of it significantly.

4S batteries will result in a fast and really agile multirotor - too agile in fact for a beginner. Start slow and learn how to fly before trying to do more crazy stuff.” Here I recommend Gens Ace 4s lipo batteries RC, Gens Ace LiPo batteries are made by a specialized factory that also manufactures packs for well-known premium brands. Glacier batteries are great for sport and 3D pilots, as well as competition drivers.

Balu has it right. 4S offers much but is heavy and requires more thought and skill to build with and fly with. Both will work (so will 2S lipo battery), but 4S will likely incur a steeper learning curve and multirotors already have a pretty steep curve to navigate.

It depends on experience, but the question hints toward a little light on the stick time. In that case Generally I recommend leaning toward 2-3S lipo battery, depenging on the size of the frame. you’ll want enough power to have good contorl over the platform, but not so much it can easily outrun your reaction time. 3S lipo battery for a frame appropreatly sized to that motor should work well. don’t expect long flight times — a 3S2200 (get 30C lipo battery or better) should yield about 7-9 min of hover time, or 4-6 minutes of crazy flight (eventually), but by the time you’re up to speed, it’s a matter of buying a new battery and swapping out for smaller props and a 4S3000 should give you much better flight times.

Some Tips Help you Know More About Lipo battery

Lithium Polymer or LiPo batteries are a great new way of storing energy for portable devices from cell phones, home electronics to RC batteries lipo packs used in cars, boats and flight. They’re great because they can store 350% (approximately) more energy than a typical NiCd/NiHm battery pack and weigh 10% – 20% less. They can also discharge much more current than a NiCd/NiHm battery and can be fully charged in about an hour.

More information on Li-po batteries:

1, The charge rate: The charge time depends on the amount of unused energy that is left in the battery, the available energy capacity (mah) that is left to fill, and how fast you charge the battery. 4.5 amps is the maximum rate that a 4000mah lipo battery should ever be charged at. A cheap 4500mAh will puff at a 4.5 amp charge, 4.3amps lower is much safer. Lower is safer, but too low waste time.

A 4500mah battery maximum charge rate is 4.5 amps, but it should be charged between 4.3amps and 2.2 amps.

A 1800mah battery maximum charge rate is 1.8 amps, but it should be charged between 1.6 amps and 0.9 amps.

The first number is max, the second number is -2 below max, and the third number is half max.

2, Amp draw problems: The motor and the load that is placed on it is what determine the amp draw from the ESC and the battery. Neither the ESC nor the battery should never restrict amp draw; if it does, you need a better one.

3, Motor Load: The dynamics of the aircraft deals with friction and momentum; it is information like the weight, Air flow obstructions and the aerodynamics of the air frame. Anytime you’re flying and you hear the motor working harder, it’s because the plane turned hard, the plane accelerated , the motor is WOT (wide open throttle), or the plane is climbing fast; these things all put more of a load on the motor.

Increasing the load on the motor creates more heat for the motor’s self-cooling to deal with. The more load, the more heat. The motor’s self-cooling can only dissipate so much heat. Anything beyond that point, the motor will overheat. During flight, When you have to control the aircraft in a certain way by doing less things that place an extra load on the motor, this is called “flight control management”. This is a great way to control the heat and keep the electronics from overheating.

4, Weight: A 35c 4500mah LiPo battery can weigh from 460 grams to 560grams depending on the brand and model number. When you look to buy a battery, weight should be one of the things you look at. A battery weight has a huge effect on the planes power to weight ratio, Two extra ounces will make a big difference in your planes performance.

1000mah – 141grams

1300mah – 176grams

1600mah – 195grams

1800mah – 216grams

2200mah – 225grams

Here Recommend Gens ACE Lipo Battery for you

Get superior performance from your remote-controlled truck, buggy, heli, jet, airplane or quad with Gens ACE 7.2V 5000mAh NiMH high-capacity, high-discharge rate battery. This battery has the same quality features you have come to depend on from genstattu.com: 12 AWG soft silicone wire leads with our patented High Current Universal Plug System, along with the power to handle even the toughest terrains. In addition, this battery includes plug adaptors to fit Deans, Traxxas, Tamiya and EC3 plug types.

Gens Ace is one of the top ranked battery corporations with deep research and manufacturing on NIMH, LI-PO, LI-FE by the effort of 200 professional engineers and technicians with 20 years exquisite battery technology. All batteries are tailored for various scales of the RC Models such as electronic cars, nitro cars, aero planes, vessels and also other models, toys, electric tools, electric bikes, electric autos, digital products etc.

The Lithium polymer Batteries Technology

Lithium polymer batteries are now being widely used in hobby and UAV applications. They work effectively because they can hold a large amount of current and are lighter than nickel metal and ni-cad batteries. But with this improvement in RC battery lipo life come potential hazards.

Gens Ace lipo battery Gens Ace lipo battery

Voltage and Cell Count:

Lipo battery act differently than NiCad or NiMH batteries do when charging and discharging. Lithium batteries are fully charged when each cell has a voltage of 4.2 volts. They’re fully discharged when each cell has a voltage of 3.0 volts. It is necessary not to exceed both the high voltage of 4.2 volts and the low voltage of 3.0 resting volts or 2.5 during discharge. Exceeding these limits can harm the battery.

The way to ensure that you do not go below 2.5 volts while flying is to set the low voltage cutoff (LVC) of your electronic speed control (ESC). It important to use a programmable ESC since the correct voltage cutoff is critical to the life of your batteries. Use the ESC’s programming mode to set the LVC to 2.5 volts per cell with a hard cutoff, or 3.0 volts per cell with a soft cutoff. If your ESC does not have hard or soft cutoff, use 3.0 volts per cell. You’ll know when flying that it is time to land when you experience a sudden drop in power caused by the LVC.

If you have previously been flying with NiCad or NiMH batteries, switching over to lithium polymer will lead to a different number of cells being used. If you had 6 to 7 cells of round cells then 2 lithium polymer cells will correctly duplicate the voltage of those cells. If you had 10-11 cells then 3 lithium polymer cells would be best for you. There are a lot of lipo 4000mah 7.4 v flyer’s out there that are stuck between 2 and 3 cells. In my experience the best option is to determine how many watts you were using before and duplicate that with your Lithium Polymers, Motor, and Prop. For example. If you were running 8 cells (9.6volts) at 10 amps on a speed 400 airplane, then you have 9.6 x10, 96 watts. So if you went with 2 lithium polymer cells (7.2 volts nominal) then you’d need to change your prop such that you used 13 amps. If you went to 3 LiPoly’s (10.8 volts nominal) then you’d need to reduce the amperage to 8.9 amps. These estimates are approximate, and some experimentation is required for best results but conserving Watts is a good way to start.

10C from 3S4P?

How fast a battery can discharge is it’s maximum current capacity. Current is generally rated in C’s for the battery. C is how long it takes to discharge the battery in fractions of an hour. For example 1 C discharges the battery in 1/1 hours or 1 hour. 2 C discharges the battery in ? or half an hour. All RC batteries are rated in milli Amp hours. If a battery is rated at 2000 mAh and you discharge it at 2000mA (or 2 amps, 1 amp = 1000mA) it will be completely discharged in one hour. The C rating of the battery is thus based on its capacity. A 2000mAh cell discharged a 2 amps is being discharged at 1C (2000mA x 1), a 2000mAh cell discharged at 6 amps is being discharged at 3C( 2000mA x 3).

Currently LiPoly technology does not allow currents as high as NiCad or NiMH batteries do. Because of this many LiPoly batteries are put in parallel to increase the current capacity of the battery pack. When 2 batteries are wired positive to negative and positive to negative they become like one battery with double the capacity. If you have 2 2000mAh cells and you wire them in parallel then the result is the same as 1 4000mAh cell. This 4000mAh cell has the same C rating as the original 2000mAh cells did. Thus if the 2000mAh cell lipo battery could discharge at a maximum of 5C, or 10 amps then the new 4000mAh cell lipo battery can also discharge at 5C or (4000mA x 5) 20 amps. This method of battery pack building allows us to use LiPoly batteries at higher currents than single cells could produce.

The naming convention that allows you to decipher how many cells are in parallel and how many are in series is the XSXP method. The number in front of the S represents the quantity of series cells in the pack so 3S means it’s a 3 cell pack. The number in front of P means the number of cells in parallel. So a 3S4P pack of 2100mAh cells has a total of 12 cells inside. It will have the voltage of any other 3S pack since the number of cells in series determines the voltage. It will have the current handling of 4 times the maximum C rating of the 12 individual cells. So say our Gens Ace 3S4P lipo battery pack had a maximum discharge of 6C. That means that it has a nominal voltage of 10.8 volts (3×3.6) and a maximum discharge rate of 50.4 amps (2100mAh x 6Cx4P ).

Some Warm Tips of Gens Ace Lipo Batteries

Lithium Ion and Lithium Polymer battery chemistries cannot be overcharged without damaging active materials. The electrolyte breakdown voltage is precariously close to the fully charged terminal voltage, typically in the range of 4.1 to 4.3 volts/cell. Therefore, careful monitoring and controls must be implemented to avoid any single cell from experiencing an overvoltage due to excessive charging.

Single lithium-based cells require monitoring so that cell voltage does not exceed predefined limits of the chemistry. Series connected lithium cells pose a more complex problem: each cell in the string must be monitored and controlled. Even though the pack voltage may appear to be within acceptable limits, one cell of the series string may be experiencing damaging voltage due to cell-to-cell imbalances.

Gens ace 2 cell lipo battery

Gens ace 2 cell lipo battery

Now the following are the 2 cell 1s lipo battery from Genstattu.com

Gens ACE 3300mAh Power Cell LiPo packs are ideal for all Rustler, Stampede, Bandit, and Monster Jam models. Power Cell LiPo packs are engineered to give the punch and on-demand power to reach the top speeds RC models are built to achieve. Premium LiPo cells developed specifically for Traxxas feature oversized discharge tabs for maximum efficiency. The cells are hard-wired with 12-gauge Maxx® Cable, eliminating the resistance and power-loss associated with plug-in wires. The standard XH plug permits balance charging with the #2933 EZ-Peak Plus LiPo/NiMH charger, and the Traxxas High-Current Connector assures total power transfer for higher speeds, longer run time, and more fun from every charge. The packs’ semi-rigid construction results in a firm, rugged, and compact pack that does not require a hard case, and the center-wire configuration assures a pinch-free fit in Traxxas vehicles. Covered under Gens ACE’ Lifetime Battery Exchange Program. Except 2 cell lipo rc batteries, we also suppy 1s lipo battery, 3s lipo battery, 4s lipo battery, and so on. Our Lithium Polymer batteries hold a large amount of energy and must be respected. Discharging or charging at an improper rate will cause excessive heat which can damage the battery, or even cause a fire!

Handling:
Do not expose the battery to excessive physical shock or vibration. Short circuiting should be avoided, however, accidental short circuiting for a few seconds will not seriously affect the battery. Prolonged short circuits will cause the battery to rapidly lose energy, could generate enough heat to burn skin, and may cause the safety release vents of the enclosed cells to open. Sources of short circuits include jumbled batteries in bulk containers, coins, metal jewelry, metal covered tables, or metal belts used for assembly of batteries in devices. To minimize risk of short circuiting, the protective case supplied with the battery should be used to cover the terminals when transporting or storing the battery.

Do not disassemble or deform the battery. Should an individual cell within a battery become ruptured, do not allow contact with water. If soldering or welding to the battery is required, consult your Energizer Battery Manufacturing, Inc.representative for proper precautions to prevent damage to the i

Charging:

This battery is made to be charged many times. Use an Energizer approved battery charger. Never use a modified or damaged battery charger. Do not charge for over 180 minutes or repeat charging without intermittent discharging. A backup charge termination based on time is recommended to prevent overcharging. The charging temperature should be between 0°C and 50°C (32°F and 120°F). The battery pack will normally warm during charging.

Charging Voltages and Currents:

Charging voltages are prevented from exceeding the specified limits by an internal battery protection circuit. Never use a battery which shows signs of a damaged protection circuit or broken case. (Such damage to the protection circuit may be indicated by voltages at the battery terminals outside of their specified ranges.) Adhere to all specified charging and discharging voltages and currents. Do not use battery if its voltage drops below the specified minimum voltage

By complying with the requirements specified above, Lithium Batteries are not otherwise regulated as Dangerous Goods. Lithium Batteries manufactured, packaged and shipped by Energizer Battery Manufacturing, Inc. meet the requirements specified above. Any Lithium Batteries subsequently repackaged or reshipped are required to meet all of the requirements specified above.



3.7v lipo battery packs are usually recyclable

Lipo battery packs can be had inside relatively large ability variants, and will become energized whenever you want inside their obligation routine. Nmh functions properly any time cool, then one chargeable Lipo RC battery can save you coming from getting and also removing tons or even a huge selection of individual utilize battery packs. These kinds of 3.7v lipo battery packs are usually recyclable, and offer guilt-free trashing while they consist of slight toxic compounds contrary to nicads, that incorporate cadmium. Established oneself upwards together with Lipo — you’ll spend less, and also you’ll help save the earth.

The essential Lipo RC battery will be old and plenty of diverse demand strategies are already employed. Back many years ago, any time voltage has been challenging to modify correctly bombarded Lipo battery packs have been crucial as the h2o may be swapped out. The particular Lipo hormone balance is pretty understanding regarding overcharging, allowing marketing and advertising agencies to access really low-cost chargers, also Lipo battery packs can easily recycling the particular gasses made to stop injury to the particular RC battery provided that the particular demand fee will be gradual. You can expect a selection of chargers coming from low-cost to be able to extremely superior, with regards to the specifications with the consumer, yet every one of the chargers we all promote off-the-shelf are usually very governed superior chargers in which can not overcharge the particular RC battery.

Entirely discharging rather than acquiring incurred with time, or higher discharging, or perhaps long-time not enough asking, almost all could cause the particular individual or maybe more batteries’ move asking voltage lower. The particular voltage regarding individual RC battery is leaner as compared to a couple of. 18V. You need to use equalized demand for your RC battery. When that can not resolve the particular voltage with the impaired individual RC battery, you would far better retrieve that independently. In the event the problem agreement, you need to use the lower existing to be able to demand and also launch regarding 1 to be able to 3 recycles, and the particular impaired batteries’ voltage and also ability will receive a excellent restoration. But also for the particular significant sulfation RC battery, you must change that.

Several Lipo battery packs are employed in the standby problem where they may be seldom cycled, yet stored continually about demand. These kinds of battery packs can be extremely extended were living should they are usually incurred with a move voltage regarding a couple of. twenty-five to be able to a couple of. 3 volts/cell (with twenty-five diplomas Chemical) (13. 5V to be able to 13. 8V to get a 12V RC battery). This kind of lower voltage is always to stop the RC airplane batteries coming from shedding h2o in the course of extended move asking. People battery packs which can be found in strong launch bicycling function may be incurred around a couple of. forty-five volts/cell (18. 7V to get a 12V RC battery) to obtain the maximum demand fee, provided that the particular voltage will be decreased for the move voltage if the demand will be full.