5C is a number indicating how much current you can out into the cell. In this case, 5 times the nominal capacity or 12 minutes. This is on a cell basis, so no m

5C is a number indicating how much current you can out into the cell. In this case, 5 times the nominal capacity or 12 minutes. This is on a cell basis, so no matter how you do it, you cannot charge faster unless you have cells with a chemistry that can handle more. In that case you'd already have a 10C or 20C battery if the cooling and electronics could handle it.