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Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
OL-15984-01
Chapter 3 Setting Up the Cisco Unified Wireless IP Phone 7925G
Installing the Cisco Unified Wireless IP Phone 7925G
Use U-APSD for talk-time power save mode. Also 5 GHz talk time is reduced up to 30 min for standard
and up to 2 hours for extended. Use of 802.11b/g and a Bluetooth headset can reduce the talk time by
40-50 percent. To extend talk-time battery life, the Cisco Unified Wireless IP Phone 7925G can use
PS-POLL power save methods. The Cisco Unified Wireless IP Phone 7925G will use either U-APSD or
PS-POLL when in idle (no active phone call).
When an AP supports the Cisco Client Extensions (CCX) proxy ARP information element, the idle
battery life is optimized. If the AP does not support CCX or proxy ARP is not enabled, then the idle
battery life is up to fifty percent less.
Table 3-4 shows the charging time for the two types of batteries. You can stop charging the battery when
the battery is fully charged. Lithium ion batteries can be partially charged without shortening the battery
life. Batteries should handle up to 4000 recharges.
Note Battery life varies because of environmental factors and Bluetooth use.
The following sections provide information about the battery and charging the phone:
• Installing or Removing the Phone Battery, page 3-8
• Using the Power Supply to Charge the Phone Battery, page 3-11
• Using the USB Cable and PC to Charge the Battery, page 3-12
Installing or Removing the Phone Battery
To install the battery in the Cisco Unified Wireless IP Phone use Figure 3-1, and follow these steps:
Procedure
Step 1 Remove the cover on the back of the phone as shown in Figure 3-1.
Step 2 To install the battery, insert the battery catches in the corresponding slots at the bottom of the
Cisco
Unified Wireless IP Phone 7925G. Ensure that the metal contacts on the battery and the phone are
facing each other.
Step 3 Press the battery to the body of the phone until it locks into place. See Figure 3-2.
Ta b l e 3-3 Batteries Available for the Cisco Unified Wireless IP Phone 7925G
Type Technology Talk Time Standby Time
Standard Lithium ion (Li-ion) Up to 9.5 hrs Up to 180 hrs
Extended Li-ion Up to 13 hrs Up to 240 hrs
Ta b l e 3-4 Battery Charging Time Information
Battery Type Power Supply Connected to Phone
Phone Connected to PC
and USB Cable
Standard 2 hours 5 hours
Extended 3 hours 7 hours
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