EXFO Optical Power Expert User Manual page 59

Maintenance
Recharging the Battery
I
MPORTANT
The battery is not charged at the factory. You must fully charge
it before using the unit for the first time. The battery is fully
charged after a few hours or when the battery LED indicator is
steady blue.
The time required to charge the battery depends on various
factors such as the type of tests currently performed and the
ambient temperature.
To ensure that the battery functions properly, keep it in
temperatures between –10 °C and 45 °C (14 °F and 113 °F). Store
it between 10 °C to 35 °C (50 °F to 95 °F).
When the ambient temperature is below 0 °C (32 °F) or when it
reaches or exceeds about 40 °C (104°F), the battery can either
charge more slowly than usual, or not charge at all, depending
on the internal temperature of your unit.
Do not leave a battery discharged for several days.
Should you notice a decrease of the autonomy each battery
charge provides, you may want to replace the battery with a
new one to maintain optimal operation conditions.
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Optical Power Expert