Hi. Check the links below. First one tells you which Polar watches you can change batteries on at home, without having to send it in to Polar. Second one shows how to change the battery (not rocket science) on a specific model (in this case the FT60) http://www.polar.com/za/support/battery_replacement http://www.polar.com/za/support/battery_change_FT60_80 Happy trails. Rob
