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Cisco CP-BATT-8821= is a rechargeable Lithium-ion battery for the Cisco 8821 Wireless IP Phone. This 4.35V, 2060mAh battery gives you up to 13 hours of talk time and 240 hours of standby time. Using a separate Cisco power adapter, desktop charger or multicharger, the battery can be quick-charged in just 3 hours. Using a USB cable, the battery is charged in 6 hours.