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• The standard battery requires about 3.5 hours to
become fully charged and provides up to 3.5
hours of active service time or 21 hours of
standby time.
• The extended battery provides up to 4.25 hours
of active service time or 30 hours of standby time.
The battery becomes fully charged in about 4.5
hours. For more information about charging the
battery, refer to the “Desktop Charger” section in
the Cisco Wireless IP Phone 7920 Accessory
Guide.