Your UA Heart Rate is powered by a CR2032 coin battery.
Under normal use, the battery should last about 365 hours. When it's time to change the battery, the LED should flash red for about 10 seconds after you turn it on.
Hold your UA Heart Rate module with the back facing up.
- Take a small coin and insert it into the opening above the HTC logo.
- Gently twist the coin to open the battery compartment.
- Remove the old battery.
- Place a new battery with the positive face of the battery facing out. The battery may seem loose, but that is normal. The battery compartment cover will keep the battery in place.
- Replace the battery compartment cover with the HTC logo upright.