What is causing shorter battery life?

[ShadowsPapa]

Also, AGM batteries suffer damage if voltage stays in the low 12 volt range for extended periods.
Heat is the other big destroyer of batteries. When I lived in Phoenix my batteries never made it past 5 years with many dying at one year.

Pretty much what I've tried to explain over the years - those who believe "it starts, they are ok" are ruining batteries. Or "12.4 is ok" - no, it's not, it's maybe 60% charged.

Heat is a total battery killer as people in TX and FL know - or yes, AZ!

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[bgott]

Just got back from a 3 weeks vaca. To my surprise, the truck started right up. Original 4.5yo main battery.

You have a teenager around the house? Check your miles, it might not have set there as much as you think!