Make your own RC Car Battery Pack or Repair NIKKO Ni-Cd 6.0V-620mAh - YouTube
Nikko 6.0v Ni-Cd battery cassette
Nikko 9.6v battery pack substitution.
Just got myself 8 AAs (Rechargeable) from IKEA for my custom 9,6 V battery pack which I use for my Nikko Super Cruiser. A bit overkill when you count the capacity lol. :
Buy 9.6 volt Radio Control Car Rechargeable Battery Pack - 9.6v Tamiya Connector (Fits Many Tyco Nikko & Radio Shack Radio Controlled Cars & Trucks) Online at desertcartAntigua and Barbuda
MIGHTY MAX BATTERY 9.6V 2000mAh NiMH REPLACEMENT BATTERY FOR NIKKO RC CARS MAX3440677 - The Home Depot
ORIGINAL NIKKO 6.0V 750MAH BATTERY PACK AND CHARGER B01562 | eBay