It appears my F6 monitor is not keeping accurant time on calories and heart rate. I like the watch but while checking my sitting heart rate is very low. When checking the heart rate on a blood pressure maching the watch is about by 20 counts. Also while exercising my calorie count appears to be off. I have tracked my calorie count on a treadmill but the watch does not appear to capture it all. (e.x. today I walked 580 calories on the tradmill but watch only showed 309.) Could ther battery needs to be changed or any ideas?

First you need to understand that the Polar system is a medical grade device and it is calculating calories based on specific information that you have inputed and heart rate data from your heart.

Most treadmills and other exercise machines use a much simpler counter that is height and weight based to calculate calories and are generally over generous with their numbers.

Depending on the blood pressure machine you are using, the pulse (not heart rate) is coming through the brachial artery, again not quite as accurate as measuring r-r variance from your heart. There is a ton of literature you can read if you are into the accurateness of the system, but I will sum up with saying that you actual calorie expenditure will be closer on the Polar than on most other devices outside of a hospital. As too the heart rate this is also true, so more likely you are getting inaccurate numbers from the other devices.

If you want pinpoint accuracy then you will need to use the Polar RS800 or S810 devices that measure and display true R-R.