Went to crank up our motorhome the other day to run it for a little and run the generator. The chassis battery was dead. Had to start it with the switch that draws from the house batteries. Let it run...
I usually put it on my B&D VEC1093DBD portable charger and let it do its magic for a couple of days. Then throw it away in the core pile. Seems like for me once they get run down that bad they are history.
I usually leave my batteries sitting on the trailer but totally switched off-line. You probably got hit by some parasitic battery drain..
NOTE: once they get run down then they are prone to freeze as stated in below post...
Roy Ken
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