how long to charge car battery

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.

While there’s no risk of damage to the battery, however, the likelihood of shocks and sparks does go up when the battery is still in the vehicle. Even after considering the fact that your battery is dead, it will not take an eternity for your battery to charge. You most probably do not have the luxury of time to wait before using your car. A car battery usually holds 48 amps so if you take that it charges at approximately 1 amp per hour you can work out how long it will take to charge your battery with various amperage chargers. The only way to charge your car battery while your car is off is via a trickle charger or other car battery charger. If your car’s battery is dead, you probably want to start your car within one hour but to fully charge a 52Ah size of battery form dead required 10 hours. Around 60 amps or more. However, we recommend using a battery charger. To determine how long (in hours) you will need to charge your battery, divided 36 by 10 = 3.6 or 3.6 hours to recharge your battery. I’m assuming that we are discussing a normal gasoline or diesel vehicle that is not a hybrid, for the purposes of my reply. And while it may seem like a good idea, running your vehicles engine five minutes a day is not enough to maintain your car battery.

If you are interested in buying a car battery charger I’d recommend the Battery Tender 1.25 Amp or 750 mA version (link to Amazon.com) . At idle, the alternator will be turning, but it likely will not be producing the maximum current available. Your battery is designed to charge while connected to a vehicle (that’s how it’s recharged by the alternator while your car is running). A 12 volt / 10 amp 3-stage automatic charger is the best charger for most automotive batteries. If you charge your battery at a 10-amp rate and you need to replace 36 amp-hours in the battery. As noted above, in a typical scenario, a car battery can be charged within 24 hours using a typical 2-amp charger. The battery will demand a lot of current because of the fact that it has been discharged.

Generally, the time taken to charge a battery from flat to full is determined by the amperage. The typical car battery has a capacity of close to 48 amp hours. How long does it take to charge the battery at idle? Once you have a dead battery, the next thing that you are most probably concerned about is how long to charge a car battery. Your risk of overcharging your car battery is far lower.