How Long To Fully Charge Dead Car Battery. But to make this possible the alternator has to manage 14 volts at the battery terminals the whole time it is being charged. Its battery is a 48-amp unit.
You can do this for about an hour before raising the charging amperage. How Can Mach1 Services Help When You Have A Dead Battery. An automotive trickle charger is not really intended to charge a dead car battery.
But if the battery was fully discharged then as others had mentioned if the battery had fully discharged then you very likely have one or more cells that are on the verge of failure.
A battery that needs a jump-start whether it needs to be replaced or not is nowhere near a full state of charge. A healthy battery shows a reading from 124 to 127 volts when we measure the voltage across the two terminals of the battery with the help of a voltmeter or some other device. 3 to 6 hours 20 Amp. If your cars battery is dead you probably want to start your car within one hour but to fully charge a 52Ah size of battery form dead required 10 hours.
