Model GR-D90U was plugged into outlet when a thunderstorm passed through our area. The next day when I went to use the unit nothing would work. Doesn\'t turn on, won\'t eject tape, totally dead. I checked the voltage at the plug on the charger and it reads 11.4volts. I checked the voltage between the + and - on the battery and it reads 7.4volts. Any ideas?

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