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A comment in case this helps. (By the way, it's my tuner). When the 7082 is powered up, stations can be preset. They will remain set until powered off. According to the manual, the battery can be recharged by leaving the tuner on for 24 hours. In my case this failed. The failure occurred some time ago when the tuner went unused for over 2 years. It was perfect before that.
Hope this sheds some light. I wish I were a "techie".