There website is a modern site that gives real time view of their inventory. The customer experience team is helpful . I would order again from them.
Cisco 8821 BATTERY EXTENDED
|Manufacturer:||Cisco Systems, Inc|
|Manufacturer Part Number:||CP-BATT-8821=|
|Manufacturer Website Address:||http://www.cisco.com|
|Application/Usage:||Wireless IP Phone|
|Battery Size:||Proprietary Battery Size|
|Compatibility:||Cisco 8821 Wireless IP Phone|