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Forerunner 201 battery replacement (Expert level):
Opening the 201 was not easy and could not be done 100% clean, but thanks to R_nz (above) I got it open.
My problem was dead (almost) battery, after 6 years of superb operation.
I found the battery to be glued (double sided tape) to the back cover.
To remove, push it up slowely and pull out. Beware of the short wires.
1. It is a flat battery, wrapped in shrinkable tube. Made by MDTechnology, P/N 043048 3.7V, 500mAh see
http://www.mydbattery.com/EN/products.asp?ID=12
2. On the cover, the battery is soldered to the underside of a small PCB, hard to get to (by expert!). If you find a battery, suggest to cut the wires and solder wire-to-wire.
I am now looking for a replacement battery at retailer level.
Any suggestion?