My OEM batteries from Thor (Harris at the time) lasted less than 6 months. I replaced them with a pair of Interstate 6V batteries. I noticed a build up of white material on the bottom of battery compartment and took the batteries back to Interstate. Turned out that one of the batteries had a cracked case. Interstate replaced the battery at no charge. Things have been OK since then. I bought a couple of acid absorbing battery pads for the batteries to sit on, and also repainted the bottom of the battery compartment.
You may have a cracked battery case which is leaking at a very slow rate - enough to show up on your battery tray but not so much that you think its any more than normal wear off.
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Rick
2017 Thor ACE 30.1
2017 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain
RVi Brake 3
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