My watch band is ripted

this is f11 it may help you
http://timlaqua.com/2008/09/how-to-replace-the-battery-in-a-polar-f11-heart-rate-monitor-hrm/

Turn the watch over and look on the back of the watch near the wrist band. The serial number is the rather long set of numbers you will see there. You can't miss it. If you see what look like zeros or letter O's, they are zeros, not O's. I have the same watch, and that is your serial number.

You can get replacement band on amazon, click here and take a look Amazon com polar band replacement. I hope this was helpful, have a nice day

Really the only thing to do is send into a Polar Authorized Service Center. If you did this for your battery replacement then you have a warranty and the service is free. If you used a regular watch place or did it yourself (never recommended) then something could have been damaged inside.

If the screen is completely blank then you need a new battery, the watches are always "on".

if there are numbers on the screen and you need to know how to get it too start for exercising then just push the red button.

In my tips and tricks page is a tip with a link to download the manual for free.

For battery replacement go to this link.

The S120 is now a fairly old watch. When the function buttons and heart rate cease to function this is generally an indicator that the battery needs to be replaced. The buttons themselves can also become worn out or weak of function, in either case you have a couple of options.

1) send in to a Polar Authorized Service center: This is very important, do not take to a normal watch shop. You need the watch properly resealed and handled correctly as well as you may need parts such as a button return spring they will not have. Plus there is a 90day warranty on Polar's repair. You will also need to send in your chest strap just to make sure that is still functioning properly. Battery repair about $15-, new buttons another $10ish, and a chest strap if needs replacing about $25 or $30-. $50-$60 total if everything needs work, but this is just an estimate.

2) buy a new watch unit. The RS100 (the current replacement) is about $100- and is easier to use with a better chest strap.

Many people replace their own batteries but some of them have problems with replacing the backs and finding (for some unknown reason) the watch no longer works!


I advise you to take your watch to your nearest authorized dealer and ask them to do it for you.

You can get into difficulty replacing batteries and it is not worth the risk for the small cost saving in doing it yourself.

The easiest is to bring it to Wal-Mart, or another store with a watch section in their store, if you buy a new wrist band, they;ll put it on for free. If you're feeling DIY, pull the watch band to the side, untill the metal bar inside is ejected form the slot in the watch, from there, insert the new band's bar into the slot, and voila!

Usually it's a problem of battery get it replaced it should fix it