EXFO FTB-500 (Window XP) - Manual (Page 262)

Maintenance
252 FTB-500
Verifying Battery Status
4. Slide the new battery in, using the image below as a guide. It will not
go in completely if inserted incorrectly.
5. Repeat steps 3 and 4 with the other battery (two remaining batteries
for the eight-slot model).
6. Close the battery compartment and tighten the retaining screw back
into position (two retaining screws on the eight-slot model).
Verifying Battery Status
The battery gauge located at the bottom of your screen indicates how
much power you have left.
If you are using the FTB-500’s batteries, the gauge will show a battery icon.
Battery poles
(-
) T
D
C
(+
)
Negative end
Positive end
Tab
Four-slot model
Eight-slot model