I have the clock now for 9 months. Now, the battery has run out. I have exactly 90 times Between 40, 50 minutes trained so that (run). The battery should last 1.5 years with daily use (60 min) according to instruction.
Polar recommends that you have to carry out the battery change the watch battery through authorized Polar dealer. This sends the clock to Polar, there the watch battery is exchanged, replaced the seal and creates a vacuum in the clock. Actually super - but does it cost 25 and lasts at least 10 days.
If you exchange the battery itself, can the sealing ring of course not replace or create a vacuum in the clock, which will void the warranty. According div. Internet forums very difficult to change the battery yourself and you can make while the clock very easily broken it.
I let the battery now wait a minute swap, then I try to change the battery yourself. It was worth it, if I can change the battery only 3 x successful. If the heart rate monitor is broken, I'll buy one that is resistant to water, despite changing batteries.
The transmitter battery (heart rate monitor) you can not change course. She is said to 2000 - hold for 3000 hours. If so, I'll buy just for 5 or 10 years, 35 new chest strap. Solang nothing worse happened ...
The clock itself is good. It measures the pulse and count calories. There is a warning function too high or too low pulse. You can read the time during training (contrary to another review), if you hold the heart rate monitor near (10 cm) on the chest strap.
