You are in a hurry on the way to work, and you jump into your car and quickly turn the key – Nothing happens.
The car battery is drained. You have a car battery charger in your garage, but how long will it take to charge your dead car battery?
Charging a car battery is not always as easy as it sounds; there are several tricks out there to save your battery and give it a longer lifetime!
In this article, you will get all the answers you want for this question, and a bit more!
How long does it take to charge a dead car battery?
Charging a dead car battery takes 4 to 24 hours for a full charge, depending on how many Amperes your car battery charger is charging with and your car battery’s size.
The most common rate for car battery chargers is around 4 amps. To fully charge a battery of the size 52Ah would take about 10 hours from dead to fully loaded, but you could probably start your car within 1 hour.
First, you have to look at your car battery charger to find out how much ampere it’s giving out. High amperes charge your car battery faster. Low ampere is better for maintenance charging of your battery over long periods.
You also have to look at the size of your car battery and the battery type. Usually, a mid-sized car uses a battery of the size 40-80Ah. You also have to take in mind the kind of car battery. An AGM/GEL battery can charge up a bit faster than a regular wet battery.
What is the best speed to charge a car battery?
The speed of your car battery charging should depend on what you want to acquire. Fast charging can damage your battery and will make its life shorter. Long-time charging with low amps is the best for keeping the battery’s lifetime long.
Usually, a standard car battery charger is giving out 4-15 amperes. 2-4 ampere is typical for maintenance charging, and it will take around 24 hours to fully charge a dead battery at this load. Check your car battery charger for any settings for the charging rate and apply the charging rate for your needs.
To charge your car battery quickly, without damaging your car battery, I would recommend charging your battery at the rate of 8-15 amperes. Charging your battery over 15 amperes can damage your battery if you are unlucky and make the lifetime shorter.
What car battery charger is best to use?
First, you have to figure out what type of battery charger you need. Maybe you need a fast one or just a maintenance charger?
Modern chargers are easy to connect and have battery charging monitoring, which will regulate the amps themselves. But anyways check to see how many amps it’s charging with before buying one.
Cheaper chargers do often promise more amps than they charge with. It’s better to choose a quality charger that gives lower amps instead. It will save your car battery, and it will minimize the risk of damage to your vehicle.
A car battery charger I really can recommend is the CTEK chargers. You can find them here on our list of “Best Car Battery Chargers.” They have several sizes of their chargers for your needs, and it’s a well-known brand probably making the best car battery chargers on the market.
Share this Post
Founder, owner & main author of Mechanic Base. I have been repairing cars for more than 10 years, specialized in advanced diagnostics & troubleshooting. I have also been a drifting driver and mechanic for over 7 years.