EXFO FTB-500 (Window XP) - Manual (Page 259)

Maintenance
FTB-500 249
Battery Maintenance Recommendations
Battery Maintenance Recommendations

To ensure that batteries function or charge properly, keep them in
temperatures between 10
o
C and 40
o
C (50
o
F and 104
o
F). Store below
50
o
C (122
o
F).

Leave the unit plugged in when not in use.

Do not leave a battery discharged for several days.

Remove the batteries if the unit will not be used for more than two
weeks.

After 300 cycles (approximately 18 months of use), replace the
batteries with new ones to maintain optimal operation conditions.
Otherwise, the operating time might be reduced.

Li-Ion batteries that are not used for a long period of time (over three
months) will not be damaged, but might need to be recalibrated.
I
MPORTANT
Fully charge batteries before using the unit for the first time. New
batteries are fully charged after approximately 4 hours or when the
LED stops flashing.
W
ARNING
Do not throw batteries into fire or water and do not short-circuit
the battery electrical contacts. Do not disassemble.