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Scott1115 rrElite Veteran Greenwich, CT  New to electrics  charging Q How can I figure out how long it will take to charge my 5000mAh packs? Is there a formula for say a 20A and a 30A charge rate if the packs are @25%? I will be charging two 5000mAh packs in parallel with a 306b icharger and balanceboard.RCRCC  

TheWoodCrafter rrKey Veteran Costa Mesa, Ca.  3C = 15AMPS = about 20 minutes, etc.You need to know what the manufacturer of your batteries says is the maximum charge rate. I mark that on my packs.What voltage is your battery? That makes a difference in the power that is required.  

eggmcmuffinplz rrElite Veteran Los Angeles, CA  2C= 10Amps and would take around 30 minutes.Parallel Adds them up, so you would now have a 10,000mAh battery, so charging at 10amps would take about an hour.That charger is 1000 Watts, so you could charge 22.2v X 30 amps(the chargers max charge rate, which in this case is lower than the watt limit).So it all depends on how fast you charge it. Basically divide the ratio of Capacity to charge rate by an hour.thus ~1Hour/3C = around 20 minutes!  

Scott1115 rrElite Veteran Greenwich, CT  RCRCC  

eggmcmuffinplz rrElite Veteran Los Angeles, CA  

Scott1115 rrElite Veteran Greenwich, CT  18.5v 5s 5000mAh packsSo, if I understand this correctly (thanks Ed) the formula is:(mAh to be put back into both batteries)/charge rate in Amps times 60 minutes.Therefore, if the packs are discharged to 25%, each needs 3750 mAh put back in = 7500mAh = 7.50A. Charging at 20A the formula would be: (7.50/20)*60 = 22.5 minutes Charging at 30A the formula would be: (7.50/30)*60 = 15.0 minutesI understand the time might be a bit more as it trickles down to balance at the end of the charge. But otherwise, do I have it right? RCRCC  

TheWoodCrafter rrKey Veteran Costa Mesa, Ca.  2C = 1/2 Hour 3C = 1/3hr = 20min. 4C = 1/4 hour 5C = 1/5hr = 12 minutes.It is that simple.  

BladeStrikes rrElite Veteran Shelby TWP,Mi  For my 12S 600E,I run two 3300mAh pack's down to 60%65% and take's about 35min's to fully charge both at 14A.Difference is the IR on the 3300mAh pack's is a little higher. C = HRS/MIN's mean's nothing because it depends on the battery and health of it.. I have a 2S 1100mAh 6.6V LiFe RC pack that take's about 45min's to fully charge at 2C after 2 flight's.Damn thing take's longer to charge than my 6S pack's.  

Band1086 rrElite Veteran Kennewick, Wa. USA  1C = 1 hour
2C = 1/2 Hour 3C = 1/3hr = 20min. 4C = 1/4 hour 5C = 1/5hr = 12 minutes.  

Scott1115 rrElite Veteran Greenwich, CT  RCRCC  

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