No, you can buy replacement battery from amazon: Energizer CR1632 3 Volt Lithium Coin Battery pack of 5 and change it by yourself for free :). cheers
Check this out for clear directions. With this info, it's pretty easy.
http://timlaqua.com/2008/09/how-to-replace-the-battery-in-a-polar-f11-heart-rate-monitor-hrm/
Found this with a google search "polar f6 battery replacement", 2nd entry.
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