Lenovo ThinkPad 770 TP 770X User's Reference that shipped with the system - Page 184
Specifications, Environment, Heat output, Electrical AC Adapter, Lithium-ion battery pack
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Specifications Specifications Size Width: 313 mm (12.0 in.) Depth: 254 mm (9.7 in.) Height: 55.5 mm (2.1 in.) Environment Note: When you charge the battery pack, its temperature must be at least 10°C (50°F). Temperature (at altitudes less than 2438 m [8000 ft]): - Operating with no diskette: 5° to 35°C (41° to 95°F) - Operating with a diskette: 10° to 35°C (50° to 95°F) - Nonoperating: 5° to 43°C (41° to 109°F) Relative humidity: - Operating with no diskette in the drive: 8% to 95% - Operating with a diskette in the drive: 8% to 80% Maximum altitude: 3048 m (10,000 ft) in unpressurized conditions - Maximum temperature at 3048 m (10,000 ft): 31.3°C (88° F) Heat output 56 W (191 BTUs/hr) maximum Electrical (AC Adapter) Sine-wave input, at 50 to 60 Hz, is required The input rating of the AC Adapter: 100-240 V ac, 50/60 Hz Lithium-ion battery pack Nominal voltage: 10.8 V dc Capacity: 4.8 AH 170 IBM ThinkPad 770X User's Reference