Plantronics Calisto Pro Series - Manual (Page 13)

Page 7
Replacing the handset battery
If you notice that the talk time on the handset is decreasing, you
probably need to replace the handset battery. Contact Plantronics
Support for information on battery pack replacement. (See “Technical
assistance” on page 49.)
Note: The headset battery is not replaceable.
Using the tip of a pen, firmly press the hole
located at the bottom of the handset battery
cover (see image) to remove the cover. 1.
Remove the old battery from the compartment. .
Place the new battery into the battery
compartment. 3.
Plug the battery pack connector into the white mating jack inside
the compartment. 4.
Slide the battery cover onto the handset and
place the handset onto the base to charge it. 5.
Charge the new battery for a minimum of 16 hours before using it
the first time. 6.