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Try draining the battery fully before you charge it. They dont always respond to half charging.
Have you checked the water battery level( I know most new batteries don,t need refilling but worth a look )( your de-ion water should be ok to use )ray
If the battery is a leisure type battery then DON'T fully discharge it!!!Leisure batteries are not designed to be ran flat.Batteries don't last forever.Contact Omnipole about your problem, they will be able to give you better advice as they know what type of battery you have and the sort of lifespan you can expect out of one.Ian