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 Certainly using a HRM expends battery power, as the watch will be constantly looking for ANT+ data, however, I'm not certain that if you are not using a HRM that the watch isn't going to look for the ANT+ data anyway.  To be safe, I would leave the HRM at home anyway.
  Certainly using a HRM expends battery power, as the watch will be constantly looking for ANT+ data, however, I'm not certain that if you are not using a HRM that the watch isn't going to look for the ANT+ data anyway.  To be safe, I would leave the HRM at home anyway. 
                                            