Cisco 7925G Administration Guide - Page 64

Installing the Cisco Unified Wireless IP Phone 7925G Chapter 3 Setting Up the Cisco Unified Wireless IP Phone 7925G Table 3-3 Type Standard Extended Batteries Available for the Cisco Unified Wireless IP Phone 7925G Technology Lithium ion (Li-ion) Li-ion Talk Time Up to 9.5 hrs Up to 13 hrs Standby Time Up to 180 hrs Up to 240 hrs 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. Table 3-4 Battery Charging Time Information Battery Type Standard Extended Power Supply Connected to Phone 2 hours 3 hours Phone Connected to PC and USB Cable 5 hours 7 hours 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 Step 2 Step 3 Remove the cover on the back of the phone as shown in Figure 3-1. 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. Press the battery to the body of the phone until it locks into place. See Figure 3-2. Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1) 3-8 OL-15984-01