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try swapping out the batteries, no harm in opening it up with a screw driver (will void the "warranty" that expired 12 years ago) check if there is an internal battery (usually a coin cell battery like cr 2025 or CR2020) otherwise it is dead and time to get an e-trex 30... great simple little unit with lots more features
Same problem. Remove the 8 screws, unsolder the battery from the circuit board, pry off leads, place electrical tape around edge of new battery, solder on the leads, solder leades on circuit board. Remember which side was up before soldier, close unit, you should be good to go.
The batteries on the units are not meant to be serviced by the unit. If you are not familiar with taking it apart, you may damage internal components in trying. If the unit needs service, it is best to return it to Garmin and let them take care of the repairs. As far as the battery not holding the charge, if you have not done so, charge the unit on the computer for a few hours. This sometimes helps.