I refurbished my battery yesterday and charged it up to 11.3V then i left it over night and it went down to 11.1V in the morning.So i put it back in presuming it was ok,I ran it for 10 min and the battery has gone down to 6.2V.But before this i had left my quad up for 3 months and done a top end head gasket so is my stator gone bad or is my battery gone?