Well what kind of battery do you have now? If it's a mini it's most likely 2/3A, and if it's a large it's most likely sub-c (SC). You'd probably want 16AWG wire.
Also, I highly HIGHLY recommend CheapBatteryPacks. They have excellent cells and make awesome high quality packs.
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Last edited by Styrak; January 6th, 2009 at 03:20..