Acer Extensa 390 User Manual page 132

Specifications
Weight
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Dimensions (round contour, main footprint)
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Temperature
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Humidity (non-condensing)
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Operating System
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Battery Pack
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A-4
2.95 kg (6.49 lb) for CD-ROM drive model
2.79 kg (6.13 lb) for floppy drive model
304~310 x 237~245 x 45~46 mm
(11.97~12.2 x 9.33~9.65 x 1.77~1.81 in)
Operating: 10°C ~ 35°C
Non-operating: -20°C ~ 60°C
Operating: 20% ~ 80% RH
Non-operating: 20% ~ 80% RH
Windows 95 or Windows NT(option)
43-WattHour Lithium-Ion or 38-WattHour
Nickel Metal-Hydride battery pack
Smart battery management technology
2~3-hour rapid charge for NiMH; 3~4-hour
rapid charge for Li-Ion.