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1) hard rubber/ solid - These can not have the battery changed.
2) soft strap with connector in middle - these you can change the battery.
If you have the soft strap, it will have a small hard around 3 inch long block that "snaps" onto the strap to connect it. These have a battery compartment. Turn it around and you will see the outline for the battery compartment. These are not always easy to open, and the batteries are a little harder to find. Take it into any watch repair and they should be able to pop a new battery in for you pretty easy.
There is a link on my tips and tricks page to get manuals for Polar products, the T-31 wearlink is the product we are talking about, it has the how to change the battery and battery type.
You probably need to "short out" the battery before you can set it.
To do this you need to remove the caseback and apply a tweezers to the battery and the "AC".
The AC is usually labeled and it looks like a little gold cricle near the battery in the watch. (I realize there may be more than one gold colored small circle in there, and if it's not labeled it will take trial and error.)
With the tweezers, or paperclip would work, touch the AC and the battery at the same time and hold for a few seconds, then release and repeat once more. This should get your watch reset and ready for you to set.
Here is the link to the user manual for your watch;
Check page 9 - you have to re-enter these basic settings after removing the battery, this may clear the error message although i was unable to confirm this from the manual.
contact polar on;
and you can find a service centre who can check your watch, all the necessary link software downloads etc.
Hope this helps :)