My old 51 back in the 60's had been sitting for about 3 weeks when I tried to start her. The battery was dead, dead, dead. I took off the covers and there was nothing in there (dry). I poured water in and it began to bubble. A few minutes later I tried to crank and she started up. What a surprise. Batteries are weird.
I also had two batteries on a tender for a year or so and took one off to use and even though the light was green the battery was dead. Batteries are weird.
