• The phone displays an
Invalid Battery Shutdown
message before it shuts down.
In these failure scenarios, remove the battery from the phone and examine the battery contact fingers and
pads.
The battery contacts are in different locations on the Webex Wireless Phone 840 and Webex Wireless Phone
860.
Note
• Check that the contacts aren’t dirty or covered with any substances, or it may prevent a proper electrical
connection.
• Check that the contact fingers on the phone are straight relative to the contact base, with all fingers at
the same height.
In the following image of the Webex Wireless Phone 860 battery compartment, the finger on the top left
illustrates damage from incorrect battery insertion.
Figure 7: Webex Wireless Phone 860 Battery Contact Damage
Phone Battery Charging
Explosion Hazard: Don’t charge the phone battery in a potentially explosive atmosphere. Statement 431
Warning
You can charge the battery using any of the following options:
• USB cable—You can charge the phone with an AC power adapter or your computer.
• Desktop chargers—You can charge a phone and spare battery.
• Multicharger—You can charge several phones or batteries at the same time.
The length of time to charge a phone and battery varies depending on the charge method.
• It takes about 3 hours to charge a phone using the USB cable and AC plug.
• It takes about 8 hours to charge a phone using the USB cable and your computer.
• Under normal conditions, a discharged battery charges fully in approximately 3 hours in a desktop or
multicharger.
Webex Wireless Phone 840 and 860 Administration Guide for Cisco Unified Communications Manager
33
Initial Setup
Phone Battery Charging
