Is it difficult to change the battery on the bar mounted unit?

I'm pretty sure it the battery, as the speed, cadence and power cut in and out on a ride. Bike was a the lbs for a week and the chain was touching the power kit, which is likely to have drained the battery.

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"Ride it like you've just stolen it!"

It's very easy, just use a coin to open the bar mounted unit, then the battery should come falling out.
Just make sure you securely close it afterwards

what battery does it take?

where would I get one from?

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"Ride it like you've just stolen it!"

It's a simple battery, like the ones used in a watch.
There's a number on the battery so you know wich one to get.
I get my battery's from a photoshop(?), a jewellery shop should have them too so it shouldn't be too hard to find one and you could always give Polar a ring.

Good luck.

cheers...

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"Ride it like you've just stolen it!"

The battery appear to be a standard battery use in most Camera's

Girlfriend is off to the shops to get me one...

CR123A

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"Ride it like you've just stolen it!"

Great!
This thread makes me want to install my power kit again, but i think it looks bad on my Storck....

The battery used in the power kit isn't like ones used in a watch (unless your watch is HUGE).

The battery in the bar mount (the one powering the power kit) is a CR123A and is approx 3cm long and 1cm diameter.

Really easy to replace. coin gets the cap off, replace the battery and coin gets the cap back on. And your away.

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"Ride it like you've just stolen it!"

Yes, i was wrong about the battery, sorry for that

Maybe too late for you but for UK (maybe European people also) the shop price for lithium batteries like this is extortionate : I've used www.7dayshop.com in the past : pretty good service (not quick : ie around 7 days delivery !!) but very cheap and a good choice of batteries and camera related gear.

Woolworth's was the cheapest in the end £4.99. Your suggested shop sells them at £5.50. Thanks anyway...

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"Ride it like you've just stolen it!"