How to charge and maintain deep cycle AGM batteries with Craig from KickAss Products

PLEASE BE ADVISED THAT THE VOLTAGES THAT ARE SHOW ARE WHEN THE BATTERY IS AT REST. READINGS WILL CHANGE WHEN LOAD IS APPLIED.

Craig from https://kickassproducts.com.au/ gives an important lesson on how to properly take care of and maintain your AGM deep cycle batteries.

AGM battery maintenance is important for maximizing the service life of your AGM battery. Note that all of the AGM batteries offered by Australian Direct are maintenance-free, in the sense that they don’t require topping up. Standard flooded batteries, also known as wet cells, require regular topping up.

This is not the case for AGM batteries since they are maintenance-free. Nevertheless, it is important to ensure that you are using your AGM battery properly, and avoid any misuse that may cause the battery’s life to be shortened. This is the type of AGM battery maintenance we are referring to. In this video, we will breakdown AGM battery maintenance.


Misusing the batteries will cause some issues that need to be maintained. One of these issues is battery sulfation, which occurs when the sulfuric acid inside the AGM battery reacts to form a lead sulfate on the battery’s negative plates and terminals.

This causes the surface area of the acid to be reduced, causing it difficult for the battery to hold a charge. In order to avoid battery sulfation, it is important to charge your AGM battery before storing away for later use. This is an important step towards smart AGM battery maintenance.

Charging your AGM battery correctly and using the proper AGM battery charger is a crucial step towards improving battery performance. Both overcharging your battery and undercharging it will cause harm to the battery. Overcharging an AGM battery will physically damage the internal structure of the battery, which usually causes it to inflate and release a lot of gas. Overcharging an AGM battery does not shorten its service life, but rather kill the battery altogether.

On the other hand, undercharging an AGM battery, especially on a regular basis, may cause the battery to never fully recharge again. With a 120Ah battery. If you constantly only charge it to 80%, the battery will lose its ability to fully recharge to 100%, even if you keep the charger plugged in. This means you’ll get a shorter service life out of your battery, which is 80% of the full capacity in this case.

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