how long to charge a car battery with a battery charger
How to charge a battery. An average car battery has a capacity of around 48 amp hours which means that, fully charged, it delivers 1 amp for 48 hours, 2 amps for 24 hours, 8 amps for 6 hours and so on.lways check the. level before connecting the battery to the charger. Top up if necessary (See Checking the batteries) and clean the battery posts. If there is a power point handy, the battery can be left in the car, so long as the charge rate is only 3 or 4 amps.