Amazon.com: Blomiky 7.4V 600mAh Li-ion Rechargeable Battery Compatible with Some Gel Water Ball Blaster and WPL C24 D12 RC Truck / D12 Battery 2 : Toys & Games
Lithium Ion Battery - 1Ah - PRT-13813 - SparkFun Electronics
Lithium Ion Polymer Battery - 3.7V 500mAh | TinyCircuits.com
Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh : ID 3898 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits