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Until I get something better, I decided to revive my old Polar HRM that I haven't used in a few years. The trouble was dead battery in the watch. So I went down to the CVS. I ended up buying a two pack of 2032 batteries and it's a good thing I did. After changing out the battery in the watch, the chest strap transmitter was also dead. The trouble is it's the T31 model strap that is sealed up molded in plastic. I figured it's dead already so I might as well take a crack at fixing it. It worked out well so here is what I figured out:

1. Take a razor and cut around the edge of the larger oval surrounding the Polar logo. Cut along one edge (I suppose you could go ahead a cut all the way around). Don't cut the middle else you might damage the circuit board or components.



2. After cutting it open like a clamshell, you'll see a black plastic cover in the front.



3. You'll need to remove the three small screws in the back to remove the cover and expose the battery.



4. Remove the plastic cover and the old battery. Don't lose the gold leads.



5. Replace with a new 2032 battery.



6. Put it all back together. Use some RTV silicone sealer around the cut edges to seal it back up and tape it to hold in place until it drys.



7. Go have a great workout with lower lows and higher highs.

Now back you our regularly scheduled program...

:thumbsup:
 

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Thanks for sharing!!

I've got one of the 500 series, 510 i believe, that's been out for years now. Just sitting in my drawer collecting dust. I've got nothing to lose with your DIY tip. Thanks again.
 

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Banned forever.....or not
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Great idea. I've got an old dead one that I kept (I never throw anythig away), that I will try this on. My current one has a year or two left in it.
 

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old school drop out
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Thanks!! My Polar chest strap died this past summer, and I've been riding without it ever since. I'll give this a try very soon.
 

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Banned forever.....or not
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This idea is "slightly" cheaper.
 

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I tried to do mine, but to no avail. One thing that was not obvious in the pictures when I first read the above is that both the front and back of the cover must be cut to access the screws and and remove the black cover. I think I scratched the back of the circuit board trying to open just the back.

Oh well. For $31 I found a new one on E-bay and the 2032 battery will fit in my cycle computer.
 

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jaded bitter joy crusher
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Tugboat said:
Or you could buy one of the CS600s which comes with a user replaceable battery in the WIND Wearlink strap.
They also make a non-WIND wearlink with a user-replaceable battery in case you don't want to spend over $300 on a new HRM. But it's still almost $60.00, so there's merit in knowing how to cut open an older transmitter and replace the $0.50 battery.
 

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The Approach for a T61 Coded Transmitter is Different

I have a Polar 720i with the T61-CODED transmitter (N2965). I saved this post knowing I would need it some day.

My transmitter went dead yesterday, so I attempted to do the "clamshell repair' described here. Having just gone through it, I must say the appraoch is slightly different, plus the replacement battery is No. 2354 vs. 2032.

If anyone is interested and wants to try this with a T61, let me know and I will post pics.
 

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Large Suburban Male
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Oh, man. I think I threw my strap away a couple of weeks ago during a cleaning frenzy.
Damn. Should have known someone here would know how to fix it.

Oh well. Live and learn.

Speaking of HRM, does anyone have any experience with the Timex HRMs?
 

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I Type, Therefore I Am
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Doesn't Polar send you a new one if you send in your dead one?
 

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murbike said:
Speaking of HRM, does anyone have any experience with the Timex HRMs?
Yes...Did not have success...Lots of crosstalk and erratic readings....Hence the reason I'm using a Polar now...
 

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rbart4506 said:
Yes...Did not have success...Lots of crosstalk and erratic readings....Hence the reason I'm using a Polar now...
Thanks, I'll get another Polar. I liked the one I had, so if there is no overriding reason to switch, I won't.
 
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