To maintain the warranty and ensure that you do not have any problems with the seals. It is recommended to send your watch in to an Authoriozed Polar Service Center. Doing anything else will void the warranty.
it is possible to change the battery yourself or have a watch repair place do it, but you or they will not have the vaccuum sealer to repressurize the seal, and any moisture that gets in there will do damage to the CPU. A little extra tip, when you send in your watch to polar there is a 3 month warranty on that service if anything goes wrong, and it happens quite frequently outside of the system, seen it many times.
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