Amazon.com: URGENEX 7.4V Lipo Battery with JST Plug 1200mAh 30C 2S Rechargeable Lithium Batteries Fit for Most 1/10 1/16 1/18 1/24 Scale RC Cars Racing Trucks and 1 to 2 USB Charger : Toys & Games
Amazon.com: YDL 3.7V 1000mAh 102050 Lipo Battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm JST Connector : Health & Household
Lithium Ion Polymer Battery - 3.7v 1200mAh : ID 258 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits