Maintenance
FTB-1v2 and FTB-1v2 Pro 291
Replacing the Batteries (High-Power Dual Carrier)
3b. Slide in the new battery, and push it toward the bottom of the unit
until it stops.
4. Repeat steps 2 and 3 with the other battery if it also needs
replacement.
5. Position the battery compartment door so that you can see its two
screws and the rounded side is facing you.