Can I Charge A Car Battery While Still Connected. If you want to charge the battery at the same time then youll need a bigger supply. It really depends on a combination of the specific car and health of the battery as well as the charger you are using.
To avoid sparks and electrical transients damaging the cars electronics. However feel free to leave it in place if the cables are long enough. It is best practice to always wear safety glasses when messing with your car battery so make sure to grab a pair before proceeding with the following steps.
Turn the headlights on for 10 seconds and then measure the battery voltage again.
The good news is any trickle charger jump starter or battery maintainer designed for a car will fall below this benchmark. Whether a pulse charger or a more traditional charger with a high charging voltage is safe connected emm may depend largely if the engine is being at times powered ON while its connected battery is under direct charge. I want to charge the 12 volt battery periodically but I dont want to disconnect it from the car as this causes a whole other set of problems. Charging batteries while leaving the car connected will be absolutely fine.
