Warm batteries

[DicknBambi]

I noticed that two of my 4 batteries are warmer than the other two. One set is around 75 degrees and the other set is around 118 degrees and they show signs of swelling. I removed the two hot batteries and am using just the two cool ones. After removing the hot ones their voltage still shows 6.5 on each one. My thought is they are going bad. They are 9 years old that I know of. Seems like that is really good. Have to see how the other two act operating alone. Just wondering if someone else has been through this. Thanks

[bdpreece]

One or probably both of the batteries has a shorted cell. At that age you really need to replace them all.

[Dutch Star Don]

If they're 9 years old, you got your life out of them and then some.

Even though the other two may be okay, all four need to be replaced. It's noy a good idea to mate old with new. They'll be unbalanced.

This is also a good chance to go AGM if you currently have lead acid. With AGM there is no maintenance like you have with lead acid.

[DicknBambi]

That’s what I was thinking. They were Interstate GC2AGM batteries. I am thinking they are long overdue being replaced. Thanks for the replies