If there are no solar panels on the roof... and the battery is a basic flooded lead-acid type... and the battery was not charged for several months, especially if the water level dropped exposing the plates - It's toast and and will never recover. It might charge up, but I wouldn't trust it to operate your slides, jacks, etc.
Lesson learned... never expect a dealer to maintain batteries. That also applies to NEW units sitting on their sales lot.
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Be creative, and have a fun life...
...and don't be an @**hole! -Ken Block
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