This is a Cisco standard Lithium-ion battery for the Unified Wireless IP Phone 7921G.
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Power
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Battery Technology
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Lithium ion
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Compatibility Notes
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Talk time: up to 10 hours
Standby time: up to 80 hours
Charging times:
Power supply connected to phone off: 2 hours
Power supply connected to desktop charger: 2 hours
Phone connected to computer with USB cable: 5 hours
Phone on and connected to desktop charger: 3 hours
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Contents
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Battery, documentation
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Returns Policy
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Due to manufacturer restrictions, all sales on this item are final.
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Warranty - Labor
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N/A
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Warranty - Parts
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N/A
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http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=8048324#BVSecondaryCustomerRatings