How long was it unplugged?
Clearly the battery was drained low enough to kill it, due to the parasitic power drains. It needs to be fully recharged and tested, preferably with a hydrometer. It may have a bad cell so it may not hold a charge.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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