Buy or Renew
Buy or Renew
Cisco Virtual Engineer generative AI bot now active in Wireless Discussion Forum. Learn more.
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
cancel
Start a conversation
7701
Views
15
Helpful
10
Replies

Cisco IP Phone 8821 Battery Standby Time

Go to solution
Staempfli_
Beginner
Beginner

‎09-07-2017 12:03 AM - edited ‎07-05-2021 07:37 AM

Hi all

Since 2 weeks we have 10 8821 Cisco IP Phones in use. On every Phones we have a poor Battery Standby Time. According the Data sheet we should have a Standby Time about 200 hours.

 

The Battery on our Phones is over one night empty.

 

System we run:

 

Cisco Unified CM System version: 10.5.2.12901-1
Cisco IP Phone 8821 Load: sip8821.11-0-3SR4-3
 
Bluetooth is Off
802.11 mode is 5GHz only
On call power save is Enabled
Display sleep is 30 Seconds
Battery Type is CP-Batt-8821
 
Thanks in advance for any suggestions
 
Regards
Andreas 
1 person had this problem
Labels:
0 Helpful
1 Accepted Solution

Accepted Solutions

Go to solution
Ric Beeching
Rising star
Rising star
In response to Staempfli_

‎09-13-2017 02:28 AM

I'm not sure but certainly possible. You can go to 8.2.x with 1142 as far as I know before there's a hard limit it's just some features after 8.0 are unsupported. You can definitely go to full-featured 8.0.x with them.

 

Ric

-----------------------------
Please rate helpful / correct posts

View solution in original post