Q&A for How to Make Your Powerwheels Faster

If two 12v batteries are connected in parallel, the 12v charger will work but if they are in series the charger will not charge it.

Not immediately, but the motor will give up in maybe 2-3 months. If you are going to use a 24v battery, I recommend changing the motor to a 24v motor.

The brushless motor requires the speed controller from the RC car. It is extremely likely that the RC speed controller will not support the amps required to move such a large object. For this idea to work, the donor RC car must also be 12v and of similar physical size.

A 12V lead acid battery can be recharged. However, there are a limited number of dishcarge/charge cycles the battery can handle before it is permanently dead. Very simply, the smaller the battery, the less cycles you get. In cases like these Power Wheels, you can expect one, maybe two summers worth of use before the battery is done.

The best way to speed up an electric vehicle is to get a bigger and/or more efficient one. You can also get a motor with more torque.

You can, but it won't last long. Too much voltage will burn up the motor. Quickly.

Yes, you can. If you gear it for increased speed, you will get less torque.

Most 12v cars have 2 speeds. Removing the screw at the side of the shifter will allow the shifter to go at a high speed (5 mph).

Simply increasing the amp hours will cause no damage to the motor. You would be keeping the voltage the same, so the motors won't see a difference. Upping the voltage is what will increase temperature in the motor and stress on the gears.

Yes. That is basically like adding a second gas tank to your car. You'll get roughly 2 times more capacity out of a single charge.