Power Wheels Lithium Battery Upgrade DeWalt 20v

The twins are 3 1/2 and the boy just turned 2. These wiz kids are fantastic at car control and only getting better every day.
The two Power Wheels Dune Racer ride on toys are running DeWalt 20v 4.0AH batteries and replacement motors from Amazon. Other than that, they are stock.
The Best Choice brand ATV has been completely rewired to eliminate the built in electronics and generated sounds. I cloned the power wheels wiring harness to make this work better. It is running a 12v 10Ah lithium battery.
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