LiPo? LiIon? NiMH?
NiMH, Wal-Mart. Energizer batterys fall apart easy, stray from those. I've had bad experience with them. They're 850mAh, however..
LiPo, Ebay. Great deals for both charger and battery packs.
LiIon, Cheapbatteryspace, and make your own and buy a charger from a hobby shop.
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