SOURCE: Polar F4 monitor is reading about 30bpm less than actual
Check that the case back is on the right way. A spring sticking out of the watch mech needs to line up with a hole in the white sticker on the inside of the case back, I think this is the receiver aerial.
SOURCE: how to replace battery in polar f4 watch
HOW TO REPLACE BATTERY IN MY POLAR TARGET WITH A TS1 TRANSMITTER
SOURCE: Where do I send Polar
mcdevito75 here, Any small watch repair shop in your area will change the battery for you.
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