NIKKO 7.2V 1600MAH mega power pack and charger (1310) in category Gadgets - Hobbies/RC Models at Easy Technology.
Amazon.com: Nikko 6.0 Volt NiCd Rechargeable Battery Cassette & Charger : Toys & Games
12V 3000mAh NI MH battery Tamiya Plug with USB charger set 10x AA Ni MH Battery Pack for RC electric toys RC cars trucks boats|Parts & Accessories| - AliExpress
Jada 9.6v battery pack and charger substitution set.