EXFO FOT-5200 Coarse Spectrum Analyzer - Manual (Page 13)

Safety Information
CWDM Analyzer 7
Battery Charger
Here are additional precautions pertaining to battery use:

Charging time is about five hours. If the indicating lamp has changed
add one more hour.

Do not allow battery to short circuit.

Keep the battery away from fire. There is danger of explosion when the
battery is near fire.

Never dismantle, change structure or distort the battery. See on
page 27 for more information.

Do not dip the battery in water or other liquids.

Do not store the battery in places warmer than 40 degrees Celsius.

Do not drop or give a shock to the battery.

Ensure the battery is oriented correctly.

Power of charger is 110~220V at 50/60 Hz.

Remove the battery when it is not in use for a long time.