美国采购需求：遥控汽车，遥控玩具

I'm reaching out because my son has a stunt car, and the battery is nearing the end of its life. I'm interested in finding out if it's possible to purchase just a replacement battery. Could you provide me with details on availability, pricing, and any specifications I should be aware of? If you have other compatible batteries as well, I'd love to hear about those options too! Thanks for your help.