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Problem is, given a typical electric car like the , it can take 15 hours to charge the battery from empty to its EPA-rated 75-mile range from that standard household source. Most plug-in cars have a J1772 port, letting them plug into public charging stations.
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.