First off, you can't charge a 6 volt battery to 12 volts. Like everybody else is saying, using a 12 volt charge would continue to force current through the battery after it reached full charge and boil out the electrolyte. It probably doesn't have enough electrolyte left to provide the current necessary to crank the engine, but can provide the relatively small amount of current necessary to run the lights.
Lead acid batteries charge to a constant voltage, set by the chemistry. A lot of float chargers will also boil the battery dry if left connected for long periods of time, hence the need for battery maintainers which cycle the charge voltage. NiCad's and similar batteris charge to a constant current, and can be left on a current limited charger almost indefinitely.
It it were me, I'd chalk it up to experience and buy a new battery. You may get the old one to recover temporarily, but it' not going to last very long anyway.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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