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. :
Battery 9.6V 700 mAh NiCd type Nikko 1296
GNB 2500mah 11.1V 3S 12C Li-ion Battery Pack 18650 Long Range FPV – NewBeeDrone
Nikko 4.8V NiCd Battery Pack and Charger | eBay
Nikko 7.2 Volt Rechargeable NICD Turbo Battery Pack Set Of 2 No Charger Included | eBay
Li-ion 7.2V 2250mAh Battery for Nikko Remote Control F1 Ferrari Car 14500C2S3PH - AliExpress
Nikko 9.6V Rechargeable NICd Battery Pack Lot Fastlane Taiyo RC Aurora Huge Capacity Li-ion 16500/800 mah Battery Pack (Hobby RC Remote Control Cars) for Sale in Heathrow, FL - OfferUp
Amazon.com: 120617 Battery for Nikko DRL Air Elite 115, 500mAh - Sold by smavco : Electronics
Nikko 9.6V Rechargeable NICd Battery Pack Lot Fastlane Taiyo RC Aurora Huge Capacity Li-ion 16500/800 mah Battery Pack (Hobby RC Remote Control Cars) for Sale in Heathrow, FL - OfferUp