Forum Discussion

allcool's avatar
allcool
Explorer
Oct 13, 2015

AGM batteries longivity ?

My buddy went to my storage unit in PHX and checked out my Toy Hauler this afternoon. Toy Hauler has been in storage since last April, the end of dune season. This year its in a 45'x12' big garage, so unfortunately it didn't get started/charged every month or 2 like years past when it was just in outside covered storage.

I'm 2500 miles away, so there has been no charging all summer.
The TH volt meter said 12.36v when he got there. Thats about the lowest its ever been. When I left it last April, it was charged up to 12.62v. The batteries are 4 years old now. They've been sitting for 7 months in the Phoenix heat all summer. Bet that garage the TH is in got up to 130°.

So anyone know if 12.36 is to low and batteries are damaged.???
My buddy started the genny with the 12.36 no problem he said, but couldn't let it run to long since its inside the garage. He did start the ac though and said the generator was running smooth. Guess I'm lucky the double dose of stabil worked for the genny carb this year...

So what you all think, is it going to be time for new batteries this year ?, or can I get another year out of it...?
  • No charging all summer and 12.36, that sounds really good to me. What are you worried about?
  • AGMs have nowhere near the internal discharge rate of wet cell batts. I had an Optima in a vintage race car that sat unattended for two years plus and fired up on the first turn of the key.

    Yours should be good to go.
  • Ivylog's avatar
    Ivylog
    Explorer III
    If you are coming to S Fla this winter then it's time to replace and I'll give you $20 each for them.

    If not, then they are fine as they are not even down to 50%. Staying charged (discharging slower) is one of the reasons to go with AGMs.