AGM Battery Life Expectancy-Introduction,Cycle Life and Checking

Battery life expectancy is not measured by the number of years alone. The frequency with which it can be charged and discharge is measured. This is known as the battery life cycle. It is recommended that AGM batteries be fully recharged as soon as possible after use. The life expectancy of an AGM battery can be up to 10 years if not overcharged. On average, an AGM battery is known to last between three and five years. An extension for up to 6-10 years can be considered if the battery is properly maintained.

AGM batteries should not be discharged more than 50 percent to ensure long service life. Discharging AGM battery over 50 percent and up to 70 percent would be fine if it is done occasionally, but it would drastically reduce your battery life expectancy if you did it regularly.

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Is it worth buying an AGM battery?

AGM batteries are among the most popular battery types for trolling motors. It is an affordable choice that can handle the daily uses of a trolling motor engine. AGM batteries are completely sealed, unlike wet acid cell batteries. These batteries are a more expensive option but do not require any maintenance. AGM batteries usually last more than other trolling batteries and are slightly longer than wet cell batteries. The AGM batteries have been proven to be very strong and can last for years. The following are other great features that make the battery worth buying.

?This battery is unspillable, meaning that you can turn it as you like, and the electrolyte will not leak out.

?The AGM battery doesn’t discharge hydrogen gas when charging; therefore, you don’t need to worry much about ventilation while charging it.

?This battery can stand very low temperatures without freezing.

?Because of their sandwich construction, they are well resistant to vibrations.

?This battery doesn’t need any water, they are considered to be maintenance-free

How many years do AGM batteries last?

The lifespan of an AGM battery will vary depending on factors like, how it is used, maintained, charged, temperature, etc. To ensure its long service life, the battery should not discharge more than 50 percent as stated already. And discharging AGM battery more than 50 percent and up to 70 percent is not advisable if it is done frequently, this will significantly reduce the battery life cycle. If you discharge your battery to 30 percent, you will have about 1200 cycles. But, if you discharge the battery to 50 percent you will get around 550 cycles. In the worst case, if you fully discharge the battery to 100 percent, you will get about 320 cycles.

Another significant factor that affects how long AGM batteries last is the temperature, if the battery is install in a surroundings with higher or colder temperatures, the battery life will definitely decrease.

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How do you know if an AGM battery is damaged？

AGM batteries are sealed lead-acid batteries; however, their internal structure is different from other lead-acid batteries. Any lead-acid battery can be damaged for the same reasons, but the pace they succumb to these reasons will differ depending on the type of battery you have. To know if your battery is bad, you will require a voltmeter or a multimeter to test it.

You will also know if the battery is bad when it can’t hold a charge and if it dies too soon while under load. If the battery reads 0 volts, then the battery may be having a short circuit. If the battery cannot reach the highest volts when charging, the battery has a dead cell. If the battery is fully charged but the voltage is 12.5 or less, the battery is sulfated.

To ascertain your doubt, use a suitable charger with an AGM setting and let it charge fully. Once done, unplug it from the charger and let it sit for a few hours. Don't worry to check the voltage immediately after disconnection because it will have a higher surface charge since it has just been disconnected from the charger and needs to be balanced.

You can now check the voltage after a few hours. A charged 12-volt battery will be around12.65-12.75. If you check the voltage after 24 hours it should stay almost the same if the battery is new and healthy.  A new AGM battery is expected to lose 1-2 percent per month if it is charged or maybe as much as 8 percent if it is an old battery. If after a day you notice that the battery has dropped to 12.25 from 12.75, which means there is a problem.

AGM battery is less susceptible to Sulfation, although it can still occur when left in a fully or partially discharged state for an extended period. Sulfation hinders a battery's ability to accept and emit charge, and if Sulfation builds up enough it can either come to a complete stop or short out a cell in flooded batteries. I'm not sure if the same could happen in a sealed battery like an AGM battery.

If you always charge your battery more than 14.6 volts at room temperature, then the battery is most likely to malfunctioning and performs below expectation. Over 14.6 volts and a sealed AGM have a hard time recombining the evaporated water from the electrolyte. If the battery stays above 14.6, the pressure relief valve will let evaporated water drain out of your battery.

Once it is depleted, it cannot be replaced and its electrolyte concentration will become heavier and heavier, reducing performance and internally rust the battery as the ratio between the water and the sulfuric acid is changed.