Polar fs2c battery replacement

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/

check the date on the batteries you are buying.....they may be very old

The Polar watches are not designed to be taken apart. It is a common misconception to think of them as watches and not mini computers.

The best case scenario is too send your watch and clip into a Polar Authorized Service center. Polar headquarters are in Finland and their should be a close center for you in Oslo.

Visit www.polar.fi to find your local service center.

Another thing, when you change the battery yourself the watch loses it's seal and is not watertight anymore. Polar uses a special vaccum chamber to repressurize the seal to maintain watertightness.

To maintain the warranty and ensure that you do not have any problems with the seals. It is recommended to send your watch in to an Authoriozed Polar Service Center. Doing anything else will void the warranty.

it is possible to change the battery yourself or have a watch repair place do it, but you or they will not have the vaccuum sealer to repressurize the seal, and any moisture that gets in there will do damage to the CPU. A little extra tip, when you send in your watch to polar there is a 3 month warranty on that service if anything goes wrong, and it happens quite frequently outside of the system, seen it many times.

http://www.infopolar.com.ar/ar-es

Open watch case back, then release the metal contact covering the battery. Memorize battery's polarity (+ up and - down), then take the battery out. Memorize the combination of letters and numbers on battery (should be something like: CR 3216 or similar). Make does not matter - Seiko is as good as Maxell, Panasonic and other reputable makes. Buy new battery with identical combination of letters and numbers and put in your watch. Replace back contact, gasket and case back. Set your watch and enjoy. Rate me, please.

HI dyer_christi

Most of these watches hold there memory whilst the batteries is still in. Unfortunately the best thing to do is to remove the battery and reset all data! I know this means you loose the hard work you have done, but I do not know of any other solution? Are you capable of changing the battery or would you like some help? I can provide additional assistance with this if you'd like. You need a small philips head screwdriver, some small tweezers and a clean bench with a few mins (say 30). if you'd like I'll help you through

I don't know this watch in particular, but I know there are two main types of bands. Coded and non-coded. The S120 uses non-coded. That means you can use possibly any band on the market. Bands I know are compatible: Sigma and Ciclosport. The Polar bands are sealed, so you can use them while swimming. That's not true of the other two I mentioned - but the upside is you can replace the battery yourself once it wears down. You can probably get a replacement band from Polar directly, or buy a cheap knockoff elsewhere.

Follow this link:

http://www.polar.fi/en/support/product_support?product=125

This is original Polar support site.Here you will find all the info available.

Rate me, please.

Make sure you don't have the battery in upside down. The large outside case of a button cell is the +positive side.