Send chest strap to factory for battery replacement. I've had Polar, Omron and Timex monitors and they were all different. Polar doesn't allow the owner to change the battery - you have to send it to him. I found that to be a major disadvantage. Previous Timex monitors weren't as sensitive as I would like and didn't last long. This clock/monitor appears to be of high quality and very sensitive. I don't need all the features of this watch - I just want to know my heart rate and so far it's doing fine. When I received them I couldn't get the device to work. I was just going to send it back but decided to call TImex support instead. It turns out that there is a small sensor in the chest strap that can be reset by pressing a small metal tab. Your hotline was pretty good. I did a reset and the monitor has been fine ever since. I recommend this to people looking for a reliable, inexpensive, yet very accurate heart rate monitor.
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