nanonstx

iTrader: (1)

I have a Lipo 11.1v 3S 4000mah battery. I was using only 1 amp to charge. It stop charging when reach 120 minutes time cut-off. It only reach 1900mah.

Question is: Do I rest the charger and continue charging the lipo again until it reach the 4000mah?

Thanks for anyone who could help answer my question.

roadrashracing2

Why are you only charging on one amp?

blis

Just charge again unless the charger is very hot, or increase time-out to 300 minutes if possible.

Tran901

iTrader: (95)

im sure that battery has a 1c charge rating...if so, charge at 4a

nanonstx

iTrader: (1)

Thanks for all the replies. My local RC store guy told me not to go more than 1 amp on battery charge. I think it is kind of low to charge for my Venom 3s 4000mah Lipo, specially it reaches 120 minutes on charge. I will go up to 4 Amp to charge now. Thanks for the replies.

EricW

iTrader: (1)

You sure he said 1 amp and not 1c?

nanonstx

iTrader: (1)

It's possible he said 1c. I may have heard it wrong and thinking 1a.

tntpoof

iTrader: (3)

you should never put 4000mah in a 4000mah battery.. max would be 3200..

cdwilliams1

iTrader: (38)

The pack's mAh rating divided by 1000 is it's "1c" rate. Set the amperage to match that number. Almost all lipo packs are safe to be charged at 1c or less. If it's not full when the safety timer kicks in, you can start the charge again or turn off the safety timer. 1c on your 4000 mAh pack is 4 amps.

To charge at a higher rate (say maybe you need to charge up right before a race), make sure your pack supports it. A lot of packs will take much higher charge rates, and that really cuts down on your charge time!

justpoet

iTrader: (16)

As others have said, 1C is the general accepted charge rate for any battery. Many allow for even higher(faster) rates. 1 Amp is very low for a 4000 mah pack, it won't hurt it to charge at the slower 1 Amp speed, but it won't help it to charge less than 1C either.

Regarding putting 4000 mah back into a pack vs 3200, this is sort of true, but not really. You should ideally not run your pack to cut off voltage (so you wouldn't have used 4000 mah worth of power). But if you do it won't hurt to put all the mah back into the pack to get it back to full charge voltage before running it again. Don't leave it fully charged though if you're not going to use it soon.