If you haven't used the device for a year, it is not surprising that it may not charge. The rechargeable Lithium ion battery may no longer accept a charge, especially if it was stored in a zero-charge condition. It' probably time to replace it. In the future, try to charge anything you don't plan to use for a while to 50-70% of full charge before storing it. I have destroyed a number of cordless phone batteries by letting them sit for a few weeks after a complete discharge, but luckily they are easy to replace.
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