Mitel NETVISION PHONE - Manual (Page 10)

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Placing the battery in the charger
Recharge the battery in the supplied charger, either attached to or removed
from the phone.
NOTE: When charging the battery attached to the phone, turn off the phone
before inserting it into the charger.
Place the battery into the rear charger slot or place the battery and phone
combination into the front charger slot. The indicators for each slot on the
charger indicate the following status:
GREEN - battery is fully charged and ready for use.
RED - battery is charging; wait until the status indicator changes to GREEN
before using battery.
AMBER - charger is charging the other battery. The charger charges the first
device inserted; charging of the other device begins when the first finishes.