Recharge Completely Dead Car Battery. However if you used a simple method like the one we explained before using jumper cables you should be able to recharge your dead battery completely. Yes a completely dead battery can still be recharged.
This is because it has to work overtime to fill up the battery. Using the alternator to deal with such a depleted battery can actually damage your alternator. Continue doing so for a few minutes.
Answer 1 of 60.
It takes up to 24 hours to fully recharge a completely dead battery. If it does not work then let the charging continue for few more minutes. Usually I would jump start the car and if it just required a normal jump would let it run five minutes while doing the paper work and. Now after few minutes have elapsed you should start the car with the flat battery.
