Suunto T4 User Manual page 50

2.
Remove the old battery.
3.
Place the new battery into the battery compartment with the positive side facing up.
4.
With the O ring in the correct position, replace the battery compartment cover.
NOTE
NOTE
48
We recommend that you replace the battery cover and the O ring simultan-
eously with the battery to ensure that the transmitter remains clean and
water-resistant. Replacement covers are available with replacement bat-
teries.
Battery covers of the transmitter belt and Suunto t4 are not interchangeable.