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1. Car Power Basics > 10. Add a Second Car Battery

Add a Second Car Battery

Adding a second car battery is a great way to get lots of standby power when the vehicle is off. You can upgrade your car so that it has the same power setup as a recreational vehicle, with one battery for starting and running the engine and another for powering devices.

Adding a second battery doesn’t really increase the number of devices you can power while the car is on—for that you need to upgrade your alternator [Hack #9] . What a second battery does do is more than double your power storage capacity, increasing the time for which your devices can run when the engine is off and ensuring that your primary battery always has the power to start your car.


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