How Do You Maintain An AGM Battery- 7 Effective Ways

AGM batteries also require maintenance like typical lead-acid batteries. But, they don’t require any dedicated maintenance for which you should acquire professional knowledge. Taking care of your AGM battery is compulsory unless you want to lose it before its expected lifespan. 

So, how do you maintain an AGM battery? First, you need to focus on proper charging. Along with using the right charger, you should follow the strict charging interval. Prevention of sulfation and stratification are other significant parts. 

There are some reasons that cause the AGM battery to die soon. Faulty storing and installation processes are the most common of them. Once you’re concerned about maintaining the battery, you’ll magically see the improvement in battery performance. 

Do AGM batteries need any maintenance?

Do AGM batteries need any maintenance

AGM batteries are maintenance-free doesn’t mean you should treat them with negligence. Along with properly storing the battery, AGM batteries require proper charging. The lifespan, as well as performance, will decrease if you overcharge an AGM battery. AGM batteries also need sulfation prevention and use recommended chargers only. There aren’t any maintenance suggestions for your AGM battery except for these. 

What causes AGM batteries to fail?

AGM batteries and general lead-acid batteries have almost similar reasons for failure. Some of the top reasons behind AGM battery failure are discussed below. 

Inconvenient temperature

Inconvenient temperature

Neither hot temperature nor cold temperature is good for AGM batteries. When the temperature is high, the battery will expel more energy than normal. That means the discharge rate won’t be satisfactory. 

Cold weather is also troublesome as it leads your AGM battery to freeze. Most severe battery failure is caused due to extreme cold weather. A problematic temperature is risky for the lifespan of an AGM battery. 

Inappropriate charging

Inappropriate charging

Inappropriate charging means charging a battery at the wrong voltage. Also, using an inappropriate charger is a part of AGM battery failure. Charging an AGM battery with low voltage may lead the battery to sulfation. That means the active material of the battery will finish soon. 

On the flip side, charging an AGM battery with too high voltage increases the self-discharge rate. Also, it accelerates corrosion and leads the battery to fail. 

Wrong storing process

There are several things to consider before storing an AGM battery. First, the storing place should be dry and devoid of unnecessary moisture. Secondly, store the battery with 100% charge. It’ll help to prevent self-discharging rapidly. 

Most importantly, storing an AGM battery at an ideal temperature is mandatory. The storing place should be around room temperature if possible. When any of the aforementioned storing processes aren’t followed, your battery will fail sooner or later. 

Using AGM batteries interchangeably

Using AGM batteries interchangeably

It’s a bad idea to use your AGM battery in various places. Some vehicles require higher cranking amps and your AGM battery might not deliver it. As a result, the battery will fail and stop working. Rather than using your AGM battery interchangeably, use it for a specific vehicle.

Faulty installation process 

Faulty installation process 

A faulty installation process may lead your battery to extreme damage such as fire. Even the battery can explode. Connecting the positive cable to the negative post is the most common battery installation fault. Sometimes, the faulty connection is also responsible for AGM battery failure. 

How do you maintain an AGM battery for a longer lifespan?

How do you maintain an AGM battery for a longer lifespan

Maintaining AGM batteries for a longer lifespan is a great initiative. Here you know about some tips to maintain an AGM battery for a longer lifespan.

Use the right charger

Use the right charger

You can easily identify the latest charge of your AGM battery. Voltage indicating digital monitors, hydrometers, and amp-hour meters are used to determine the charge. The charging condition won’t be similar for the right charger and wrong charger. Using the right charger allows your battery to hold a charge for a longer time. 

Prevent sulfation

Sulfation is a process that isn’t wanted by any battery owner. This process is occurred due to keeping the battery uncharged for a long time. Once sulfation occurs, it’s too late to save the battery. Therefore, you should focus on prevention as prevention is better than cure. Ensure a period charging cycle for your battery to ensure its highest health. 

Avoid stratification

Stratification is a disaster that occurs for partial charging and discharging of an AGM battery. This process creates a chemical imbalance inside the battery. As a result, the battery can’t perform to its fullest potential. After a certain time, the battery will be damaged permanently. Never let your AGM battery charge partially to prevent this trouble. 

Never charge a heated battery

Cooling off period is essential for the longevity of a battery. Periodic recharging may make the battery hot. Charging the hot battery isn’t the right choice considering overall safety. Along with grid corrosion, it may lead the battery to complete failure. Better, let the battery decrease its heat and recharge it later. 

Perform periodic equalization

Equalization is an extended, low-current charge after performing a full charge to an AGM battery. This process helps to ensure a normal charging cycle month after month. Until your AGM battery is periodically equalized, its cells aren’t balanced. That means your battery has a high possibility of performance deficiency and partial failure. Periodic equalization should be performed carefully with the help of experts. 


Now, this part will reveal some most asked questions about the AGM battery as well as answers. 

How long can you store AGM batteries?

AGM batteries may die after several years if they’re not properly stored. A full-fresh AGM battery with proper charge and temperature can be stored for up to six years. AGM batteries have a self-discharge nature and so checking their battery level from time to time is recommended. 

How often should I charge my AGM battery?

Despite storing the battery and using it, you should charge your AGM battery after every six months. Charging an AGM battery before storing is mandatory and its charge level should be 100%. When the charge is below its desired voltage level, you can charge the battery. 

Do AGM batteries need to be kept charged?

Yes, it’s because AGM batteries have a self-discharge nature. Its internal chemicals react even if it’s in idle condition. AGM batteries don’t have extremely high discharge rates. Therefore, store it with a full charge and recharge it when it’s below the recommended voltage level. 


You’ve already understood the right process to maintain an AGM battery. Also, you have a clear conception of the problems of ignoring the maintenance of AGM batteries. AGM batteries tend to discharge slowly. Therefore, proper maintenance is the key to its highest longevity.

It’s never hard to maintain an AGM battery with your fullest effort. All you need to do is ensure an ambient storing temperature. Besides, you need to keep the storing place dry forever. If you’re going to store the battery, then perform periodic equalization. 

The most common AGM battery failure reason is using an inappropriate charger. This endangers the battery’s performance on a larger scale. Maintaining the AGM battery also includes determining the charge level and liquid level regularly.

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Marcelo Araujo-Xavier

Hi, Marcelo Araujo-Xavier is here! I am the author of Batteryhint. I have been working in the battery industry for over 20 years and have a passion for helping people find the best battery for their needs. I have personally tested and reviewed hundreds of different batteries. I'm certified by the International Association of Automotive Battery Manufacturers. I have always been interested in batteries and how they work, so I decided to start this website to share my knowledge with others. I hope you find the information on this website helpful and informative. I will be regularly updating this website with new resources, If you have any questions or comments, please feel free to contact me. I would love to hear from you and help you find the best battery for your needs.

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