Replacement Battery for the Cisco Unified IP Conference Phone 8831 ^^ Fully replaces battery number CP-8831-MIC-BATT ^^ Lithium Ion Rechargeable Battery Pack ^^ 3.7 Volt ^^ Cells Made in Japan ^^ 500 mAh Capacity Rating ^^ Manufactured by Artisan Power, a leader in premium quality replacement battery packs. ^^ Compatible with 8831 Daisy Chain Kit and 8831 Speaker base