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. :
Melasta 8S AA 9.6V 1600mAh NiMH Battery Pack with Tamiya Discharge Connector for RC Cars Boats RC Gadgets Airsoft Guns|battery pack|battery battery batterybattery pack nimh - AliExpress
Akku Nikko 9,6 V/700 mAh | Clas Ohlson
9.6V 2100mAh NiMH Rechargeable Battery Packs for RC Car, RC Boat, 8 Cell Battery Pack with Standard Tamiya Connectors Plug| | - AliExpress
Nikko 7.2v Battery Pack and Charger Substitution
VTG NIKKO Battery Giga Power Pack 9.6V-650mAh Ni-CD From Netherlands NEW SEALED 4986158012651 | eBay