If those batteries are 5 years old they are most probably done in. The generator bringing them down a half charge in short order indicates to me they are shot. Pull them out after a charge and have them load tested. If they are the originals at 5 years old they are running on borrowed time IMHO. I usually get maybe three good seasons from my wet cell batteries and then I replace them. They are not that expensive in my opinion to fool around keeping after 3 years.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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