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Should the power cables be disconnected when charging a car battery?

1 Answers

LaJoy

07/29/25 5:37pm

It is recommended to disconnect the power cables when charging a car battery, because the car's electrical circuits remain active even after the vehicle is turned off and locked. For instance, the control circuits for the car doors continue to operate - when using the remote key to lock/unlock the vehicle, the doors will automatically open/close. Therefore, if you connect an external charger to the battery without removing it from the vehicle, it may potentially damage the remote door control system. The principle of car battery charging: The charger's voltage must be higher than the battery's voltage to enable charging. The greater the electromotive force difference between them, the faster the charging speed and the larger the charging current. Typically, a 24V charger has a maximum (no-load) voltage of 28V, with 60A indicating its maximum output capacity. When charging, the charger is under load, at which point the voltage becomes the actual charging voltage of the battery, with 40A representing the charging current. This current will gradually decrease as the charging process completes. Additionally, the charging current magnitude also relates to the battery's capacity size.

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