[sc_rufctr]

I've been using a Garmin for about 3 years now.
It still works fine but the internal battery can't hold a charge now and if you don't drive the car for a few days it loses it's date and time settings.

I've opened it up thinking I could replace the battery but I haven't been able to find a replacement anywhere.
(The clear plastic front is secured with double sided tape. The screws to open the case are under this)

It's a 3.7 volt silver flat pack. There's an Ebay seller based in Hong Kong selling these but the details and dimensions are vague.