How to change the battery on a Polar F11 Heart Monitor

Maybe you can find a replacemente. Do a google search for terms
Heart rate Monitor, the make, model and PARTS

If can't find, do a search for Manufacturer's website and try to get information from some "Contact Us" option. Some even have a phone number.

A shot in the dark:

Accessories Polar USA

Polar Transmitters Straps and Heart Bras

heart rate monitor parts Google Search

Elastic Strap for Heart Rate Monitor Garmin

this link below may be helpfull to you there seems to be a few peolpe ha the same problem
http://timlaqua.com/2008/09/how-to-replace-the-battery-in-a-polar-f11-heart-rate-monitor-hrm/

u may have started wearing a Polar F11 Fitness heart rate monitor to help you keep track of your pulse during cardiovascular exercise. The monitor consists of a strap with electrodes that you attach to your chest, which transmit heart rate data to a receiver worn on your wrist like a watch. The wrist unit stores data and settings that you can customize, such as your weight, height and target heart rates. However, you may wish to reset the unit and start over with new settings. You can reset your Polar F11 by following a few easy steps.
Instructions

1. • 1 Press any button to activate the Polar F11 Fitness heart monitor unit.
     
   • 2 Press all buttons on the Polar F11 Fitness heart monitor simultaneously, except the "Light" button. There are five buttons and the "Light" button is at the top left side of the unit. Continue to hold the buttons until the display fills with digits.
     
   • 3 Press the "OK" button, which is located on the right side of the unit in the middle of the up and down buttons. The Polar F11 Fitness heart monitor will reset.
     

You may have started wearing a Polar F11 Fitness heart rate monitor to help you keep track of your pulse during cardiovascular exercise. The monitor consists of a strap with electrodes that you attach to your chest, which transmit heart rate data to a receiver worn on your wrist like a watch. The wrist unit stores data and settings that you can customize, such as your weight, height and target heart rates. However, you may wish to reset the unit and start over with new settings. You can reset your Polar F11 by following a few easy steps.
Instructions:

Press any button to activate the Polar F11 Fitness heart monitor unit.

• 2 Press all buttons on the Polar F11 Fitness heart monitor simultaneously, except the "Light" button. There are five buttons and the "Light" button is at the top left side of the unit. Continue to hold the buttons until the display fills with digits.
  
• 3 Press the "OK" button, which is located on the right side of the unit in the middle of the up and down buttons. The Polar F11 Fitness heart monitor will reset.
  

There is a step by step guide in my tips and tricks of things to try with your strap. If none of these work and you are getting a signal from another source then you need to get either a new strap, a new sender or both. If you send the T-31 wearlink into polar they can run a diagnostic and see which is bad and sell you just the piece you need or a whole new chest piece.

Please go to my tips and tricks page, there is a link to download the manual for all polar products.

Here is the direct link to the F11 in english. If you need in another language than follow the link at my tips and tricks page.

The T31 is the chest strap. The F11 comes with the T31-Wearlink (soft strap) the T31 is a hard strap. different user manuals. The manual you want is listed as (wearlink 31 coded transmitter)

Click on my profile (escapement), then click on Tips and Tricks. There you will find link to all POLAR watch manuals. Rate me, please.

This is really easy to do yourself. Get a CR1632 battery, unscrew the four screws on the back (dont tip the watch as there is a small spring in the watch), unclip the metal band holding in the old battery noting the way 'round the battery is in (minus side up), pop in new battery and push clip back down, when re-fitting the back make sure the spring mentioned earlier lines up with the white sticker with a hole in it on the inside of the watch back, screw down the back. After you have re done all your settings you may need to re-aquaint the watch with the strap, to do this put on the watch and strap, set the heart monitoring going, bring the watch up close to the 'Polar' logo on the chest strap until the time is displayed, should now be all set up.

Andy

Had the same problem. Just figured it out. The center Polar Logo on the strap needs to touch your chest in a firm way. Bend it back slightly so it fits snug on the middle of your chest.

I' advise to start with battery check. If the battery is ok, then you will need a professional to find the cause of malfunction.