The typical car battery has a capacity of close to 48 amp hours this means that when the battery is completely charged it will deliver 1 amp for a period of 48 hours or 2 amps for a period of 24 hours or eight amps for a period of 6 hours. How long to charge a car battery at 4 amps a 4 amp charger can charge a 50 discharged small car battery 200 315 cca or rc 40 60 in about 6 to 7 hours a mid sized battery 315 550 cca or rc 60 85 in 7 to 9 hours or a large car battery 550 1000 cca or rc 85 190 in 9 to 17 hours double these times if the battery is fully discharged. How long to charge a car battery at 2 amps charging your car battery with a 2 amp car battery charger will take a reasonably long time up to 24 hours to reach an acceptable charge this is determined by the fact that your car battery is usually 48 amps and it takes about 1 amp charge per hour on average. How long to charge a car battery at 2 ampss is the next question i receive a lot now this 2 amp option will take longer maybe even overnight but it is the best way to recharge a car battery . If you charge your battery at a 10 amp rate and you need to replace 36 amp hours in the battery to determine how long in hours you will need to charge your battery divided 36 by 10 36 or 36 hours to recharge your battery a 12 volt 10 amp 3 stage automatic charger is the best charger for most automotive batteries unfortunately most
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