• 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 Cisco Wireless Phone 840 and Cisco 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 Cisco Wireless Phone 860 battery compartment, the finger on the top left
illustrates damage from incorrect battery insertion.
Figure 9: Cisco 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 Cisco Unified Communications Manager Attendant
Console 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.
Cisco Wireless Phone 840 and 860 User Guide
44
Phone setup
Phone battery charging
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