Amazon.com: melasta 8.4V 4200mAh Hump NiMH Battery Pack Fit for Tracxas RC Racing Car Truck Boat Tank RC Hobby, 7-Cell Rechargeable RC Nimh Battery : Toys & Games
Amazon.com: Tenergy Airsoft Battery 8.4V NiMH Battery Pack with Mini Tamiya Connector High Capacity 1600mAh Batteries for Airsoft Guns MP5, Scar, M249, M240B, M60, G36, M14, RPK, PKM (2 Pack) : Sports
Pololu - Rechargeable NiMH Battery Pack: 8.4 V, 2200 mAh, 4+3 AA Cells, JR Connector