I've always found that the water gets low over time, and I simply had overlooked checking this battery.

I've always assumed that since some of the car electronics are always on, there is always a low-current drain on the battery, and lead-acid batteries don't like this. Additionally, we have a Nokia cell phone car install kit in the car, and up until about a year ago my wife would often leave the phone in the car, and it would be charged with the car battery. Throw in a couple of jump starts for my old BMW and I'm assuming that did the trick.

I'll check the voltage across the battery just to be sure.

THANKS

Brian