Lenovo ThinkPad Edge E440, User Manual, Page: 32 / 186

– Height: 26.3 mm (1.04 inches)
• For E540 models:
– Width: 377 mm (14.84 inches)
– Depth: 250 mm (9.84 inches)
– Height: 26.6 mm (1.05 inches)
Heat output
• 65 W (222 Btu/hr) maximum or 90 W (307 Btu/hr) maximum (depending on the model)
Power source (ac power adapter)
• Sine-wave input at 50 to 60 Hz
• Input rating of the ac power adapter: 100 to 240 V ac, 50 to 60 Hz
Battery pack
• Lithium-ion (Li-Ion) battery pack
Battery life
• For the percentage of the remaining battery power, check the battery status icon in the Windows
notification area.
Operating environment
This section provides information about the operating environment of your computer.
Environment:
• Maximum altitude without pressurization: 3048 m (10 000 ft)
• Temperature
– At altitudes up to 2438 m (8000 ft)
– Operating: 5.0°C to 35.0°C (41°F to 95°F)
– Storage: 5.0°C to 43.0°C (41°F to 109°F)
– At altitudes above 2438 m (8000 ft)
– Maximum temperature when operating under the unpressurized condition: 31.3°C (88°F)
Note: When you charge the battery pack, its temperature must be at least 10°C (50°F).
• Relative humidity:
– Operating: 8% to 80%
– Storage: 5% to 95%
If possible, place your computer in a well-ventilated and dry area without direct exposure to sunshine.
Attention:
• Keep electrical appliances such as an electric fan, radio, air conditioner, and microwave oven away from
the computer. The strong magnetic fields generated by these appliances can damage the monitor and
data on the hard disk drive.
• Do not place any beverages on top of or beside the computer or other attached devices. If liquid is spilled
on or in the computer or an attached device, a short circuit or other damage might occur.
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User Guide