48v is 13 groups of 18650s in series. You can have 2, 3, 4, 5, etc cells in each group., so 4 x 13 would be 52 cells and 5 x 13 would be 65 cells. The current is shared between the cells in the group, so in a 52 cell battery at 24 amps, each cell has to give 6 amps. In a 65 cell one, each cell...