Sorry for another setting question.
I have just had to replace my second 120ah AGM in 14months and short of getting 2 faulty batteries I need to know why. Both batteries had very little use. last one sat in my shed connected to the controller for 5 months and failed on my first camp 2 weeks ago.
I have a 75/10 set to agm and thought that was all I needed. Left it connected to a small panel thinking I was doing the right thing keeping it topped up.
What am I doing wrong?