This article was originally posted April 5, 2015, and updated January 5, 2016.
The Polar H7 Bluetooth heart rate sensor is must-have equipment for working out! I’ve had mine for a few years now, and it tracks how many calories I burn and how strenuously I work.
Because I use it almost every day, I have to change the battery a few times a year. The first time I changed the battery, I could not for the life of me figure out how to re-pair the sensor with my iPhone.
Thank goodness for the interwebs. :D
I found this lifesaver of a comment from Mike Bengtson on Amazon:
To factory reset the H7 so that it can re-pair with your phone properly take out the battery and take a paperclip to short the two battery tabs on the unit for 1-2 seconds. One tab is the copper colored center one and one is a very small silver one on the side. Simply take a paper clip and short these two for a couple of seconds, replace your battery and voilà — it will show up again to pair with your phone.
Polar should absolutely make this tip part of their basic documentation.
Because this is the only thing that works!
Thank you, Mike, for sharing this trick and saving me from tearing my hair out.
January 2016 update
I’m not sure what happened, but Mike’s instructions above worked wonderfully for awhile. Until they didn’t. And then I was stuck once again.
So back to Google Search I went. And I found this article:
Polar H7 Not Pairing? Discharge It (no longer available)
I’m now back in business again. And I’m crossing my fingers that I won’t need to deal with these troubles for a long, long time!
June 2016 update
Please check out the comments below for some other solutions! Thanks to all of you lovely Polar H7 owners who took the time to share your expertise! :)
P.S. The battery you need is the CR2025.