Originally Posted by
visual_rabbi
So with a lipo 5000 mAh 20C the charge time would be?
Or 5000 mAh 40C the charge time would be?
Would a 100W lipo charger allow you to charge two 2S batteries at the same time?
At 1C, its about an hour. The 40C or 50C has nothing to do with charging time.
The only way toi shorten charge time is to use a fast lipo charge mode which just eliminates the CV part of the CC/CV lipo charge. You get about 85-90% charge with the shorter time. The other way is if the lipo allows 2C or higher charge rates, anything abive 1C will shorten charge time.
The Passport has a max charge rate of 8amps and is 100watts. If you try the two 2S 5000mah lipos in series, thats equiv to trying to charge a 4S 5000mah lipo and the Passport would be able to deliver a 1C charge to a 4S lipo - 16.8v x 5a = 84watts. Passport doesn't have enough power for a 2C charge.
If you tried charging them in parallel, would be trying to charge a 2S 10,000mah equiv and you'd be limited by the max charge rate - you couldn't charge at 10amps, just 8amps, but otherwise, it could charge them in parallel. It would take some time to charge in parallel since you'd be charging at less than a 1C charge rate.
For this charger and these lipos, series charging would be better, assuming you can solve the balancing connection (for either case).