Battery is what's required for the 4 wheeler. Plugs right in and works fine. My 3 year old grandson has no trouble taking it in and out and charging it. It takes over night to fully charge it and he puts it on early in the morning and plays with it on and off most of the day. He has a lot of fun playing with the 4 wheeler. Then he puts it on the charger for the next day. I'm sure if he rode it constantly, it would run down quicker, but I could buy another battery in that case. The price is good. I recommend buying it if you need it.