Can you leave a battery charger connected?

Yes. We encourage users to leave the charger connected to the batteries and AC when storing the application. Once the charger completes its charge, it will begin monitoring the voltage of the batteries. Lead-acid batteries self-discharge over time and the self-discharge rate increases as batteries age.

Do all car battery chargers need to be plugged in?

Vehicle battery chargers normally plug into a household outlet (110-120 volt AC) in order to recharge a battery. They don’t need to be plugged into an outlet. They also don’t re-charge your battery, but rather provide the necessary amperage to crank the engine and start the vehicle.

When Should I disconnect my car battery charger?

Leave the charger or cables in one place while the battery is charging. Turn off and unplug the charger when the battery is fully charged. Disconnect the cables, starting with the negative cable, and then moving on to the positive cable [source: CarsDirect].

Can I leave the battery connected when the tender charger is plugged?

So the short answer is ‘Yes, you can leave the Battery Tender® Plus (BT Plus) battery charger connected to a battery even when it is being used to provide power to another appliance.

What should a battery charger read when fully charged?

When Fully Charged, How Many Volts Should A Car Battery Have? Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts.

Is it safe to leave a trickle charger on all the time?

Some trickle chargers can safely be left connected for months without doing harm to your battery, providing an easy long term battery maintenance strategy. Others may only be left connected for a few days at most. Be sure to check your trickle charger’s manual for details.

Can you charge car battery without disconnecting terminals?

Yes – you can. Just be sure to connect the positive (red) wire first and be sure that your car charger has the correct setting(s) before you connect to the battery.