User manual POLYCOM PTB400

[. . . ] The handset is placed in the front compartment and a single spare Battery Pack may be placed in the rear slot. Either slot can be chosen to take priority (the first Battery Pack placed into either slot is charged first) so that the handset is always ready for use. Full charging is accomplished in approximately two hours for each Battery Pack. [. . . ] Set up the Link Dual Charger by placing it on a flat, horizontal surface in order to ensure proper contact with the Battery Pack contacts. Connect the power supply to the charger and plug the power supply into an appropriate wall outlet. The LEDs will light only when a handset or Battery Pack is inserted into the slots. To remove the Battery Pack from the handset, slide the Battery Pack down and off while pressing the Battery Pack release button on the back of the handset. To replace the Battery Pack, align the top of the Battery Pack with the arrows on the label on the back of the handset. Gently press and slide the pack toward the top of the handset until it snaps in place. The user must end any call in progress by pressing the END key on the handset before placing the handset into the charger. The call will not automatically terminate when the handset is placed in the charger. The Battery Pack and handset will only fit into the charger compartments one way. The Link Dual Charger may occasionally need to be cleaned to maintain appearance and ensure battery contact. Wipe the surface with a clean, water-dampened cloth or paper towel to remove most films or residues. If the soiling is too stubborn for plain water, a mild detergent solution may be used. Be sure to wipe away any detergent residue with a plain water dampened cloth. The battery contacts may be cleaned with isopropyl (rubbing) alcohol applied with a cotton swab, cloth or paper towel. [. . . ] The Link Dual Charger will only successfully charge NiMH Battery Packs with a YELLOW label on the handset contact side. Older Battery Packs with a GREEN label will not charge in the Link Dual Charger. If the indicator light is flashing with a Battery Pack or handset in the slot, check to make sure the Battery Pack has a YELLOW label. [. . . ]