How Do I Charge an AGM Battery Correctly?

August 17, 2021 10:50 pm Published by Leave your thoughts

AGM batteries are ideal for a wide range of uses, from powering your electronic devices and cars to providing backup power to your UPS. If you don’t properly charge your AGM batteries the right way, however, they can prematurely age and die out much faster than they should. If you’re wondering how to charge an AGM deep cycle battery, read on to get to know some of the best charging practices to ensure your battery enjoys a long service life.

Invest in the right charger

Many people wonder how to charge an AGM battery the right way. The best way to charge an AGM battery is with a charger designed for that specific purpose. When charging, remember that AGM batteries must not be charged over 14.8 volts in most cases. The manufacturer of your particular battery probably has a specification and guide sheet to set some specific rules and guidelines.

When the battery is charging or discharging, the acid moves to or from the positive plate. The process is slower than with a wet battery, so the voltage is lower to allow the process to complete without heating the battery too much and causing damage. Chargers that allow for AGM charging are labeled for that purpose to maintain top performance and protect the battery from overcharge, undercharge and cell balancing.

Understand how charges for AGM batteries are different from traditional lithium batteries

AGM batteries have much different requirements compared to other batteries, such as lithium ion batteries. AGM batteries contain lead acid and require special charging procedures. While lithium batteries like those commonly found in laptops can be charged partially without doing harm to the battery, the same can’t be said for AGM models. One of the most important considerations when it comes to how to charge an AGM deep cycle battery is that you should overcharge them to give them a “top off.” If you invest in a smart AGM charger, it does this for you—you’ll never have to worry about an incomplete charge.

Pay close attention to temperature

When charging an AGM battery, pay close attention to the acceptable temperature range for charging. The upper limit for all types of lead acid batteries, including AGMs, is 40 degrees Celsius or 104 degrees Fahrenheit. Never charge the battery in temperatures below freezing, or 0 degrees Celsius and 32 degrees Fahrenheit. Ensure a long service life by only charging when temperatures are in the acceptable range.

Expect the battery to warm up

AGM battery cells may warm up during charging. This is normal and nothing to be alarmed about, and you can even use the battery while it’s warm. If a battery gets too hot during charging, you can always give it a break by disconnecting it until it cools off.

Learning how to properly charge an AGM battery helps keep your unit in good health, saving you money and hassle. Get in touch with Texford Battery Co. to learn more about proper care and handling of lead acid batteries, including AGMs.

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