Battery Voltage - Victron

I recently bought a 2021 T@G Boondock in December 2024.  It came with a Diehard Gold RV battery (24DC-2).  Over the winter (Dec 2024 - Mar 2025) I removed the battery and kept it on a trickle charger in my garage.  The reading when I put the battery back in the T@G from a voltmeter was 13.5V.  

We went camping a few weeks back and have the trailer stored uncovered at a storage facility.  The Victron shows that the battery voltage is 13.8v however my voltmeter shows 10.0v.  The battery settings in the Victron are set to default.  Due to the discrepancy, it doesn't seem like the solar panels will ever charge the battery as it thinks the battery is charged.   Is there anything I can try?


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