Polar H9 draining batteries for fun

Where’d you buy the batteries from?

There are a LOT of fake ones out there that will last between a week and ‘not even work at all’ in the use case we use them for. If you bought them on eBay they’re almost certainly fake IME

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Yup, unit had been in an airing cupboard thats always 28C+ and bone dry. Battery door was also left open & facing upwards. It was left for 36 hours.

Batteries were bought from local supermarket, Energizer Lithium CR2025 brand with an expiry date of 06/2033

First battery out of the pack of four lasted 12 months. The other three under 2 week with the last one being tested prior to use showing 3.2V

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You definitely covered all the bases.

Update on this

After sending the info over to Polar and findings showing battery depletion even without it being used or attached to a strap, they have been immensely helpful.

Unable to find a fix, they sent over a voucher to purchase a new strap & sensor from their UK website.

Not only that, but a voucher big enough to order a H10 when I had a H9 originally.

Given my strap was bought in early 2021 (I got my initial purchase date in this thread wrong after checking my emails), that is GOAT level of customer service.

Bravo

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I never thought to check the manual :joy:

I’m going to try this!

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I will have to give it a try as well. Bought H9 in April 2024 and started using it in the summer. Battery went dead in 2 weeks and handful of uses and I figured that maybe the battery wasn’t too fresh. New battery installed from the same blister pack that supplies my Wahoo strap and again it went dead in 2 weeks.
Wahoo and Garmin straps will last me for months on the same battery.
I stopped using H9 but maybe it’s time to try disconnecting or if this doesn’t help then i’ll contact the Polar support.

Yea , should be getting almost a whole year with even daily use.

Have one, will never buy again. My Garmin HR Pro goes at least for a year and none of this “disconnecting” BS.

I think next time I change the batteries on my Polar H10, I’ll record it in Garmin gear, so I can track how many hours the battery lasts. It is of course dependant upon how many radios (Bluetooth, Ant+, Gymlink) I have enabled.

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