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Batteries used in rv’s generally have a 1 year warranty. Because that is how long they last if not used and maintained properly.
Your deep cycle decal on the battery assures you of nothing different than a car battery. It tested ok when discharged.
A true rv battery is designed differently. A good choice is two GC2 batteries. Much more tolerant to abuse. If treated properly they last 6-8 years.
Without a battery monitor likely you discharged the battery beyond the 50%. Every time is a nail in the coffin!
If the battery is truly disconnected the wet cell battery discharges about 5% over the storage time per month. Mine are in Ohio. Stored from Christmas to April. Generally down 20%.
If not disconnected they will discharge in less than 2 weeks.
Lithium is becoming the best choice. Amazon! $800 for a 200 ah dc battery.
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