I would take a look at some Venom 6 cell or 7 cell batteries. a 2500 MAH will last you about 15 minutes. a 7 cell is a little more power then a 6 cell but increases the chances of ruioning someting, been there. take a look at the Prophet Plus LCD. i have one and its great had adjustable amps so you control how long it charges. you can charge any nimh or nicad battery.