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So, for a 3000mAh battery, we would want to charge at 3A, for a 5000mAh LiPo, we should set the charger at 5A, and for a 4500mAh pack, 4.5A is the correct charge rate. The safest charge rate for most LiPo batteries is 1C, or 1 x capacity of battery in Amps.
If one pack has 5-7 cycles more then the other it's fine.. it's not a huge difference.. just don't run your 2s pack with another 2s pack, then ocassionally run your 3s pack the packs will have different cycles on them.. you always need to run them together to keep them as equal as possible.
You are free to increase the voltage of the battery you use in your RC, but you need to make sure that that voltage is within the limits of the range specified by your user manual. If you neglect to check this, you may damage your RC vehicle beyond repair.
Do not overcharge NiMH batteries. Put simply, this means that once the battery is fully charged you stop charging it. There are a few ways to know when your battery will be fully charged, but it's best to let your battery charger handle it.
LiPo batteries also sustain a higher voltage for a greater duration of each run, so your model will have more “punch,” go faster, and run longer with a LiPo than it would with a comparable NiMH pack.
A battery that has a higher C rating delivers more energy, and that means higher performance. The big difference between batteries with different C ratings is the fact that the higher-rated batteries suffer less from voltage drops under load.
Can you charge a LiPo battery without a charger?
- Extract the batteries from their designated device.
- Find other LiPo batteries with similar characteristics and properties such as voltage and cycle rates.
- Connect and battery terminals together and appropriately and tape them down.
Charging via a balance lead is fine. I have a couple of lipos charging this way as we speak. Only issue with charging in situ is if the cell puffs (can't get it out) or bursts into flames.
Most lipos have a charge rate of 1C (1 hour) and occasionally 2C (30 minutes). And then there is the high performance RC car and aircraft LiPo batteries, such as Turnigy Graphene . They can charge at 15C. That's 4 minutes.
So when charging LiPo batteries, usually you only have to adjust to the charge current. It's recommended to always use balance charging. Balancing chargers ensure that all the cells are charged evenly and there are no differences in voltages between them.
Puffing or swelling shows that the battery is damaged, and therefore you should discontinue discharging or charging immediately. Further, swollen cells have a higher IR; thus, you should stop using the entire pack immediately. Damaged LiPo batteries get puffy, and releases smoke when charging.
Charge your pack fully before first use. Charge your LiPo battery pack at 5C or less on the LiPo setting only. You must use a balance charging system similar to the Hyperion, Hitec, or Graupner chargers offered here at MaxAmps.
If you've been running the lipo in between the short charges that aren't long enough to fully charge, you may have you the lipo down and caused a cell imbalance - usually when charger takes a longer than normal time its voltage imbalance between cells.
A LiPo battery is designed to operate within a safe voltage range, from 3V to 4.2V. Discharging below 3V could cause irreversible performance lost and even damage to the battery. Over-charging above 4.2V could be dangerous and eventually cause fire.
So why do LiPos explode? It's actually pretty simple – the Lithium ions inside a LiPo do not like to be exposed to air. All LiPo explosions occur for one reason: one or all of the cells in the pack get punctured or ruptured somehow, exposing their innards to the air.
With these tools, It's actually pretty easy to recover these batteries.
- Connect the main plug of your LiPo battery to your NiMH charger and start charging at the lowest current possible.
- After a minute or two your battery should recover to about 3.3 volts per cell.
A good battery should be able to hold a good balance between cells for a month without a problem. But if your charger already have a balancer built in you might as well use it. Plus it's also nice to see each cells individual voltage if your charger has the ability.
Yes, you can do it, a lot of the new lipo packs coming out are allowing a charge rate of 2c, but a lot of the chargers are not keeping up with the battery technology, there are only a couple of chargers out there that will charge at 10c and that's only good for a 5000mah battery at 2c, if you have a 6500mah like me or
How to calculate charging time yourself?
- Divide the load power by 1,000 for a value in kilowatts.
- Divide the power of your battery (also in kW) by the figure obtained to get the charging time.
- First calculate your load power (P), by multiplying the voltage (U in volts) by the current (I, in amps).
Lipo Battery C Rating2C would be 2 times that current. A 0.2C rate would be 1/5th of that current. So in our 3000 mAh battery example, the 1C rate for the battery would be a discharge current of 3 Amps. 3000 mAh = 3 Amp-hrs => 3 Amp-hrs/ 1 hr = 3 Amps.
A 1C rate means that the discharge current will discharge the entire battery in 1 hour. For a battery with a capacity of 100 Amp-hrs, this equates to a discharge current of 100 Amps. A 5C rate for this battery would be 500 Amps, and a C/2 rate would be 50 Amps.
In the ideal/theoretical case, the time would be t = capacity/current. If the capacity is given in amp-hours and current in amps, time will be in hours (charging or discharging). For example, 100 Ah battery delivering 1A, would last 100 hours. Or if delivering 100A, it would last 1 hour.
If all you want is a short rule of thumb here is it – You need 25W of charge power for each LiPo cell, for a 5amp charge rate. One 2s = 50w, one 3s = 75w, two 3s at the same time (or one 6s) needs 150w, and if you want to charge 2 6s at the same time, plan on at least 300w.
A fully charged 2,200 mAh 3S LiPo battery would have a voltage of 12.6. Charging at 1C, it would draw roughly 28 watts of power (12.6 volts x 2.2 amps = 27.72 watts).
How long does it take to charge a 5300mah 7.4v lipo battery? If charged at 5 Amps, it takes about an hour. I read a guide on charging lipo batereis that says a safe rule of thumb is to charge for each 1000mah at 1 amp, so 5000mah would be safe to charge at 5 amps.
