I'd not advise to do that, but if you want to do it yourself, follow this: Open the watch case back, undo the battery contacts, memorize battery polarity, memorize all the writings on battery, buy exactly the same one and repeat all actions in reverse.
SOURCE: Sportline S7 HRM watch users guide?
To get a manual for your monitor, go to "sportline.com",
Select "products" and then "see products" in heart rate monitors.
Go through the list of models to find yours and then click on "learn more".
Details of the monitor will be shown and you then click on the tab marked "manual".
Download your manual.
Testimonial: "thanks :)"
Make sure the back of the watch is spotless and your skin isn't too dry.
SOURCE: my heart rate monitor keeps stopping picking up my
Click on my profile (escapement), then click on Tips and Tricks. There you will find link to all POLAR watch manuals. Rate me, please.
SOURCE: how do you turn on the heart rate monitor on a
Click on my profile (escapement), then click on Tips and Tricks. There you will find links to all watch manuals. Rate me, please .
SOURCE: Sportline 915 heart rate watch 2nd mode questions
the number is for your age, the F or M is for female or male. this will give a more accurate percentage for your heartrate
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