Hi,
Everything was going along fine; I parked my car for a few hours. Never left anything electrical on, and when I got back and tried to start the car the battery was completely (And I mean completely - no dome lights, dashboard lights, etc.) dead [The battery is 7 years old]. I got a jump and with the alternator supplying electricity everything was fine. After driving for an hour when I got home the battery was just as dead. I put a voltmeter across the terminals and it only registered 7.5 volts (I would have tested it with a hydrometer, but the battery is completely sealed). I have since put in a new battery and everything works fine.
I thought batteries died gradually. How does a battery die suddenly, and does this happen often? With any other battery I owned it gradually deteriorated.
Larry