Polycom SpectraLink 8002 Series - Manual (Page 9)

English 9
handset is placed correctly, the red indicator light will come on. The
indicator light will not come on when the slot is empty, when the handset
is improperly seated, or when the Desktop Charger has no power applied.
The indicator light will remain on until the handset is removed.
Dual Charger
The Dual Charger is designed to charge the Battery Pack in the handset and
also charge an additional Battery Pack in the rear charging bay. The
handset has charging priority when both slots are occupied. Place the
handset in the front slot, facing forward. The Battery Pack alone snaps into
the rear charging bay. The LED indicates the status of the Battery Pack in
the rear bay. When the handset is fully charged or is removed, the Battery
Pack will begin charging. Note that the time it takes for the Battery Pack to
charge will be lengthened if its charging cycle is interrupted by the
placement of a handset in the front slot.