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When the car isn't running, appliances pull power directly from the battery. Unplug all cell phones, GPS navigators, or any other appliances plugged into the charging port once you turn the car off. Don't plug anything back in until you start the car again. Don't leave anything plugged in while the car is off. This could drain the power and result in a dead battery. Just like appliances, these lights pull power directly from the battery when the car isn't running. Once you turn the car off, turn off all the lights that are on. Don't start them up again until you start the engine. Double check to make sure your headlights are off before walking away from the car. Car batteries recharge when you drive, so don't leave the car sitting for weeks at a time. Take drives of at least 20 minutes once a week to give your battery enough time to recharge. If you can't drive the car for any reason, let it run for 20 minutes without moving. It's not an ideal solution, but it will help the battery stay charged. This is the ideal voltage for a battery charge. If the battery falls below this level, its performance and lifespan will decrease. Get a voltmeter and connect the positive lead (red) to the battery's positive terminal and the negative lead (black) to the negative terminal. Hold them there for a few seconds and wait for the meter to produce a reading. If the charge is below 12.6 volts, connect a battery charger by attaching the negative lead to the negative lead first, then connect the positive lead to the positive terminal. Recharge the battery to 12.6 volts. Always wear rubber gloves when testing and charging the battery. Test your battery every 6 months. Do it at least once when the weather has been cold because low temperatures can decrease the battery charge. A trickle charger hooks into a power outlet and provides a steady charge to the battery. This keeps the battery at the correct charge even when you don't drive the car. It's a useful appliance for cars that aren't driven often. Connect the trickle charger the same way you could connect a normal charger. Hook the negative lead to the negative terminal first, then connect the positive lead. Then plug the charger in. Leave it attached until you drive the car again. Trickle chargers are popular among owners of rare or collectible cars that they don't drive often. It's best to use the trickle charger when the car is in a garage. This prevents debris from getting under the hood.
Unplug any appliances when the car isn't running. Turn off the headlights and interior lights when the engine is off. Drive the car regularly to keep the battery charged. Keep your battery charged to 12.6 volts. Attach a trickle charger to the battery if you don't use it for long periods.