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b) Chest strap
The battery might not be inserted in the chest strap yet. If so, insert it as
described below.
• Use a coin to open the battery compartment (2) on the back. Turn the battery
compartment lid (1) anti-clockwise until it can be taken out.
• Insert a type CR2032 coin cell battery into the battery compartment (2) with the
correct polarity. The positive terminal ("+") of the battery must point outwards towards
you as illustrated above.
• Re-attach the battery compartment lid and lock it by turning it clockwise (see arrow
and "CLOSE" on the battery compartment lid).
• If the heart rate monitor stops displaying measured data, the battery must be
replaced.
