Amazon
https://www.amazon.com/Roller-Racer-Batteries-Non-marring-92184/dp/B09YTGXLJB/ref=sr_1_6?crid=1S0D5DA99HZ9O&keywords=roller+racer&qid=1679246145&sprefix=Roller+racer%2Caps%2C102&sr=8-6
Fits me fine :)