Roger, you can no longer use the wall wart charger that comes with flight packs. I use a Super Nova field charger which will identify the battery and cell count and automatically charge at the optimum rate, once done it will trickle. Also it will cycle the battery by drawing down power to a safe level and then recharge. Triton makes a good one as well and is a little easier on the wallet. In a battery I look for milli amps, voltage is the rate or flow. Simply put, its the volts that push the current to its destination. Joe