Lazy Bushman
Very Active Member
The last 20% of a charge will always take ages compared to the first 80%. A charger doesn't charge to the max of your setting for the whole charge. Most LiPo chargers follow a 2-part process, using a "constant current" technique first and a "constant voltage" technique second. During the "constant current" portion of the process, the charger ramps up to its specified amperage output and keeps that amperage constant as cell voltage rises. When the cells hit a certain threshold, the charger switches over to "constant voltage." During this portion, the charger varies current output to keep all the cells of the battery at the same voltage. Balancing occurs in this part of the charging process. As the charger nears completion, current drops off significantly until the battery is fully charged at 4.20V per cell, at which point the charger stops. Note some of this is a quote I got from some guru ages ago but lost where I got it from to give proper credit.....I ain't that smart, but I can read if the font is large enoughI tried a balanced charge today at 2c it really didn't seem to charge that much faster on my charger, I don't know if my balance port is limited? It was set on 10 amps, still took well over an hour to charge a 6s from 3.78 volts per cell.
I'm presuming your charging a 5000Mah battery which means your charger needs to be supplying about 252W to charge it at 2C (half of that for 1C). If it can't then it will absolutely charge slower.