Save money by using a generic 12 volt battery instead of a Power Wheels brand battery.
Here are the materials needed:
12 volt/ 12ah Mighty Max Battery (make sure it can fit in the car): https://amzn.to/49Envql
30Amp Breaker: https://amzn.to/46lSynS
12 Gauge Wire: https://amzn.to/3sFeYCZ
Lever Snap Wire Connectors: https://amzn.to/3SLo4Zq
12 AWG female spade connectors: https://amzn.to/3SHMR0B