I attempted to go out in the Jeep to my dad's birthday dinner the other night but when I tried to start it I got nary a groan... just click, click from this 4 year old battery.
I was able to get a ride and after the all important cake and ice cream I took a look at the beast about 8 PM.
The specific gravity was pretty low on the first two cells and the next 4 read DOA.
My charger decided to die at that point and I ran next door to borrow Ed's 6 amp unit.
At 2 AM (6 hours of charging) I had 2 cells about half charged, 1 about a quarter, and 3 DOA.
At 6 PM (22 hours charging I had 5 cells at 100% and the 6th at 75%.
It sat all day yesterday.
I was ready to buy a new battery tonight but for some reason I asked the counter guy to run a test on it. The 'eye' showed green (battery charged) and he started the 50% load (325 amps). Battery voltage stayed in the green the whole time. Start the engine..... alternator charging to spec, voltage correct, battery passed.
So what happened?
The parts man suggested that perhaps I left a light on. There were not lights on at that moment but did I turn it off without thinking some time when I was working on it and now don't recall it?
Any ideas?