Here is a point that is often missed about charging lipos.
Most lipos are charged at 1C. 1C = the battery capacity in AMP HOURS. So, a 5,000 mAh battery would be charged at 5 amps. A 1,300 mAh battery would be charged at 1.3 amps. A 500 mAh battery would be charged at 0.5 amps and so on. Notice no mention was made of the number of cells.
All lipos charged at 1C will take a little less than an hour to charge if almost drained without regard to the number of cells or battery capacity. A 5,000 mAh single cell will take as long to charge as a 5,000 mAh 6 cell or a single 138 mAh single cell.
1C = 1C with any battery.
Big battery or small battery, single cell or 10 cell.
That is a concept that is a little difficult for beginners to grasp sometimes.
Hope this helps someone