Do You Have To Disconnect Car Battery Before Charging. When the car starts turn off the engine of the charging car before disconnecting the cables. Always connect the charger to the battery before switching the charger on.

How to Charge Your Car Battery. There are differing opinions of how long a trickle charger can be left on a battery and for that reason different types have been manufactured. Part of the series.
I just have to disconnect the leads.
Always disconnect the negative cable usually black first and reconnect it last. Disconnect your car battery Although charging a car battery while still connected or in situ is possible its always a good idea to disconnect the battery before charging after a quick clean. It really depends on a combination of the specific car and health of the battery as well as the charger you are using. This will help prevent a spike to that cars computer.

