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Id definitely change the battery , as unfortunately these batteries are prone to failure and short lifespans since they are simple coin cell batteries..
You can either use a service like this that will provide a new battery and replace the battery for you, for 50$ http://amzn.to/297baOI
Or, you can order the battery yourself http://amzn.to/28WDHsx for 24$ and replace the battery yourself, or have it replaced locally.
With those options being listed.. If the device was purchased brand new under a year ago, garmin would repair this for you as part of your warranty.
Since the device was purchased in the US, you need to follow the steps on this page to contact the garmin US office if you want them to replace it as part of your warranty.
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