Nikko 9.6v battery pack and charger substitution set.
Batteries - SRCX - YRG Robotics
Nikko 9.6 V Ni-MH Battery and Charger: Amazon.de: Electronics & Photo
Ni MH 9.6V 350mAh Rechargeable Battery for Model Toys w/JST XHR 2P|batteries lg cell phone|battery notebook acer aspirebattery operated string led lights - AliExpress
9.6v 3000mah Rechargeable Battery + 9.6v Charger For Rc toys Car Tank Robots Gun RC Boat AA Ni-MH 9.6v 2400mah NiMH Battery Pack - AliExpress Consumer Electronics