Suunto T6 User Manual page 12

To replace the battery:
Make sure that you have purchased an original Suunto battery kit (including battery
and battery lid with installed O-ring) before you start replacing the battery.
1. Insert a coin into the slot or a Suunto battery-opening coin into the slot or holes
located in the battery compartment cover on the backside of your device.
2. Turn the coin counterclockwise until it is aligned with the open position marker.
Then, turn and lift the cover with the coin simultaneously, until the cover opens.
3. Remove the battery compartment cover and the old battery carefully. Avoid
damaging the contact plate.
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