I would recommend victors because you are very unlikely to need a replacement . As for batteries, the current is the mAh ratings. You can buy 12-24v packs ranging from 800mAh to 4000mAh (0.8 amps - 4 amps for an hour). Satanix was using an 18v 3300 mAh pack of NiMH cells. It lasts me 2 fights if I'm not ragging it around, and I am running speed 900's.