A ride-on toy car for kids.

Wheels/tires#

The minimal upgrade is to replace the plastic wheels with rubber ones. What’s needed: measure the wheel and axle diameters, purchase wheels, and attach the motor drive to the new wheels.

Power 12V#

Instead of the built-in battery, you can connect a 12 or 20-volt battery from power tools. Reports say the motors work fine, but to avoid burning out the electronics (radio/Bluetooth and lights) a step-down converter is required.

Power 24V#

The next step is to replace the motors and the control unit with 24V ones and connect two stock batteries. You can also try powering 24V from a 20-volt power tool battery.

24 Volt Children Electric Car DIY Modified Wires and Switch Kit,with Remote Control

Battery protection#

To avoid killing the power tool battery, it would be worth adding a deep-discharge protection circuit.

Idée fixe#

As the ultimate upgrade, it would be cool to add a freewheel clutch, independent brakes, and steering controlled via Arduino with a PlayStation joystick.