[Shaun @ Tru6]

Originally Posted by MBAtarga

AGM batteries generally last longer than standard lead acid batteries. Because of their low self-discharge rate, AGM batteries also last longer than their flooded counterparts when not in use. A well-maintained AGM can last up to 7 years, while flooded batteries typically last around 3-5 years.Jul 6, 2021

Originally Posted by pwd72s

Absorbed Glass Matt...like used in optima batteries. Has been around for years. Totally sealed.

https://www.thedrive.com/cars-101/36405/what-is-an-agm-battery#:~:text=An%20AGM%20battery%20is%20a%2012-volt%20car%20battery,%28or%20Material%29.%20How%20 Does%20an%20AGM%20Battery%20Work%3F

Thanks Mark and Paul, hope to replace it this weekend.