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Sudden Battery Deterioration

Hello 

Garmin 735xt has been working fine for a number of years. Battery life between on average 10-12 days. The device ran out of battery last week and when rebooted the battery life is now 48 hours max! Not sure if it upgraded the software when it rebooted but I can literally watch the battery gauge drain in front of my eyes...surely this can't be right?

Any ideas

Dave