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I haven't tried to deplete the U-1 battery because complete discharge is

said to severely shorten a wet cell's life.<< Hi Steve.. Complete discharge is somewhere around 10 volts, IIRC, my power books are at the store. And you're right..even going to 10V isn't too good an idea. 50% is a good figure, or maybe 11VDC. I've only seen one completely flat battery, and that was last week on daughter's car..) volts. Most of the batteries we get in exchange at W-M read somewhere in the 8-9V range. Harvey/Ga M-17 Stargazer #294