WARNING, this can be dangerious if you don't know what you are doing. The lead acid batter can leak or expload if the charging circuit is incorrectly installed.

This is an early picture of the prototype tractor battery modification. Note that the battery still needs to be secured.

In the final version (I'll add pics later) the 110v plug is available without lifting the seat. The battery is secured, and the seat is bolted closed and not accessable by the kids.

I also added fuse protection between the battery and the powerwheel powersystem. There is no fuse between the charger and the battery as it has automatic protection.