Before going on vacation, some drivers remove their car’s battery to prevent it from dying by the time they return. But is that actually necessary? It depends on your battery and how long you are away.
A car battery typically holds a charge for about two to four weeks, although this largely depends on the condition of the battery when the car is stored. Batteries older than three years can discharge more quickly, especially in modern cars, because systems such as the clock, radio, ECU and dashcam consume a small amount of power even when the vehicle is turned off. So if you are traveling for more than four weeks (again, depending on the battery life and its charge when stored), it is advisable to disconnect the battery or connect it to a trickle charger to ensure it has enough juice to start once you get back.
Some car manufacturers recommend disconnecting the battery if the car is not used for about six weeks, whether it is a petrol, diesel or hybrid car. However, with hybrid cars it is recommended to disconnect only the 12-volt battery and not the high-voltage battery. When going on holiday, it is advisable to store your car in a cool, dry place, as extreme cold or heat can further deplete the battery. Of course, make sure that the lighting and accessories are turned off.
Are there any disadvantages to disconnecting the battery when you go on holiday?
Reconnecting the battery will likely reset the radio, GPS, and other presets. The car’s security system and keyless entry may not work until the battery is reconnected, which can be risky if the car is parked outside. You may also need to use the physical key to unlock the door if the keyless entry stops functioning. If you prefer not to disconnect the battery, you can ask a neighbor or friend to run the engine once a week to keep the battery in good condition.
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