Anwser: An AGM battery can generally last between 3 and 5 years and up to 8 years if the battery is used properly.
That’s about two to three times longer than a flooded battery.
But overall, their lifespan depends on several factors, including:
How it's charged
How it’s used
The working temperature
If these items are done improperly, that will shorten the battery’s useful life.