There has to be some people who left a tractor or some piece of equipment out in a field somewhere maybe a whole year... Went out there one day and it started, that would make my 5 months seem pretty sorry as a Guinness record applicant.

EDIT; I just went and tested my 4 boat batteries I have for my electric motor on my boat... they all were charged up to the same level before I put them away for the winter 4+ months ago 12.8v to 12.9v. Two of them are 4 years old and the other two are 1 year old, they showed 12.8v, 12.7v, 12.6v, 12.6v. I believe that 12.6v is considered fully charged and would bet that any one of them would start my truck if I hooked it up...