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Scott R, three year is f'n pathetic. My electric toothbrush is going on 10 years and has been abused.
There may be a flaw in the charging/regulatory system which is ending those batteries early. Lead-acid(and most batteries) do better when they remain near fully charged with the temperature constant and a light load.
Look into A123 and others. They are a big name and do large scale projects. It might be worth spending more for a warentee and peace of mind.
There are several Lithium Ion variations, some of which have excellent specs.
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