How long does it last with a 1 hour charge..... 35 minutes? :-) Sorry, I couldn't resist. At any rate, your battery has a major calamity. BTW a full charge takes about 8 hours. You could get a hydrometer and check the specific gravity of the acid in each cell to get an idea of how charged it is and if any cells have failed. Sounds like it does have at least one bad cell and you really shouldn't continue using it like that.
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