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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.
RE: How long does a car battery charger take to fully charge a battery? My car broke down on me again and weâve been charging the battery on an external charger for a couple of hours now so we can see if it was the battery or my alternator.eport Abuse. Depenind on what type charger you have Shops use commercial chargers Properly charging an automotive battery goes like this. Charge at a rate of 30 amps for 30 minute intervals and recheck. This can take up to 8 hours to fully recharge a battery.