I had an AGM battery that was 4-5 years old when my slides started working slowly. Took the battery to where I had purchased it, a Batteries + bulbs store, they tested it and said it was good. I took it home and reinstalled it and put it on the charger over night. Still the slides were sluggish and didn't act quite right. Took the battery back to them and they checked it again, said it was good. I bought a new battery anyway. Took it home and put it in and like magic the slides worked as normal. Still do after 2 seasons. Just because they say a battery is fine doesn't mean it is.
