![]() If you’re wondering how I achieved these numbers, you can check out my full article here why go into the methodology of how I calculated all of the values of this chart. The approximate amp hour range times are estimated below. Regardless I have a table here that will give you a good ballpark estimate of how many amp hours your battery is rated at just by looking at the cold-cranking amps or the reserve capacity number that is on the sticker on top of your battery.Īmp Hour Estimates Based On Cold Cranking Amps or Reserve Capacity If Your Sticker Reads: 200-315 CCA, or 40-60 RC If Your Sticker Reads: 315-550 CCA, or 60-80 RC If Your Sticker Reads: 550-1,000 CCA, or 80-190 RC 36 - 46.2 AH 46.2 - 58.8 AH 58.8 - 111 Check the sticker on the top of your car battery and find where it matches up on the table. They’re all different measurements for different purposes. It would be like saying that your car can go from 0 to 60 miles per hour in 6 seconds and then you trying to figure out how many miles per gallon it will get when you go 60 miles an hour. As you can see, my Ford Escape battery has 590 Cold Cranking Amps.Ĭonverting Cranking Amps or Reserve Capacity over to Amp-Hours is not a direct relationship. You will typically see a reserve capacity or cranking amps or cold-cranking amps. The problem with car batteries is that they are rarely labeled on the sticker with amp hours. Keeping the amp rating of your charger in this range allows your battery to fully charge overnight, but it also is gentle enough on the battery to give it a thorough charge as well as not damaging it through overheating and electrolyte loss. Most vehicle batteries will fall between 50 and 70 amp-hours, so a 5 to 7.5 amp charger would be ideal. If your battery was rated for 50 amp hours, a 5 amp charger would be suitable. With that being said, it is best to use a charger with an amp rating that is about one-tenth of the total amp-hour capacity of a lead-acid battery or less.įor example, if you knew that your battery was rated at 100 amp hours, you would want to use a charger that was rated at 10 amps or less. Either way, they will fall into the lead-acid category. They might be sealed, where you cannot check the electrolyte inside. They might be flooded lead-acid, which is where you can pop the cap off to check the electrolyte inside. How Many Amps to Charge Your Car Battery AtĪt this time, nearly all car batteries are lead-acid. This will charge most drained car batteries overnight without a problem. It has had daily use for over 6 years and hasn’t let me down. Let’s quickly dive into this topic to ensure you stay safe and your car battery lives as long as possible! One of my favorites is this 4-amp charger. That’s the quick and easy answer, but there are a few things you want to watch out for. A three-stage or smart charger is recommended for the best results. Charging amps in this range will allow the battery to be completely charged overnight and will not be at risk of overcharging. How many amps should you charge your car battery at?Ĭharging a car battery at 4 to 7.5 amps is the safest and most efficient. ![]() With too many, you risk fire or explosion. With too few amps, your battery will take forever to charge. While the process of hooking up a car battery to a charger is relatively easy, there are some nuances of the process that you’ll want to keep in mind to ensure that your battery is not damaged and that you’ll maximize its potential lifespan. Charging a car battery seems pretty easy, right? You just take any charger with any amp rating and hook it up to your car battery.
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