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A normal 30 minute drive will probably put the charge you used to start the car back in, but I think it's marginal. Once the car is moving at 20mph+ the battery is being charged, so long as you don't have all that stuff working.
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.