Battery Life Span?

There is no all encompassing answer for that question as there are far to many variables. First, batteries deteriorate over time. If left in a discharged state, this can happen rapidly, but it varies with degree of discharge. Batteries also loose a little life every time they are discharged, with the amount again a variable based on how deeply they were discharged, and how soon, and how they were re charged. How rapidly the battery is discharged can affect life expectancy, and again how rapidly they were recharged can have an affect.

That said, I try and do a fair job of maintaining my batteries but do end up abusing them from time to time. 30 to 60 days average camping with 12 volt group 24's and I get somewhere between 5 and 9 years of useable life. Never had one start showing significant loss of performance in less than 5 years. A couple may have lasted past 9 but I get rid of my older batteries when I trade out rigs.

Batteries that have been maintained decently generally don't fail suddenly when camping. The usual failure mode is to gradually lose capacity until one deems the capacity insufficient for one's needs. There are of course exceptions, but I don't know that such exceptions are really correlated with age--in other words, it's not obvious to me that older batteries are more likely to catastrophically fail than younger ones if both seem to be in OK shape to begin with.

If the batteries you have seem to be serving you well, there's no reason in my estimation to replace them just for the sake of replacing them.

Hi,

I got a little over nine years from mine.

It really is a function of how they are cared for.

Solar may be the best way to extend battery bank life.