[mshmodela]

I can tell you that what I suspect I experienced this past year was to slowly discharge my battery with a 6V/2A auto-sensing charger --I suspect (newbie comment). I charged my battery with a non-sensing 6V/6A charger for 12 hours --twice over two days... 24 hours in all over two days.. Oh and yes I have a battery disconnect switch so nothing could have drained the battery..

You may wish at least try a longer sets of charging (and not over night) and see if it will hold a charge.. Mine sat for 12 days in my non-heated garage and it spun the engine just fine...