Plantronics Calisto User Manual page 59

Changing the battery
If your handset battery does not keep a charge, you can replace the
battery.
1. Using the tip of a pen, press the notch at the
bottom of the handset battery cover to remove
the cover.
2. Remove the old battery from the compartment.
3. Place the new battery into battery
compartment.
4. Plug the battery pack connector into the white jack inside the
compartment.
5. Slide the battery cover onto the handset and
place the handset onto the base to charge it.
6. Charge the new battery for up to 15 hours before using it the first
time.
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