Dell Latitude C640 - Manual (Page 121)

Battery
Type 8-cell "smart" lithium ion (4460
mAh)
Dimensions:
Depth 88.5 mm (3.48 inches)
Height 21.5 mm (0.83 inch)
Width 139.0 mm (5.47 inches)
Weight 0.43 kg (0.95 lb)
Voltage 14.8 VDC
Charge time (approximate):
Computer on 2.5 hours
Computer off 1 hour
Operating life 3 to 4 hours with average usage;
can be significantly reduced under
certain
power-intensive conditions
Life span (approximate) 400 discharge/charge cycles
Temperature range:
Operating 0° to 35°C (32° to 95°F)
Storage –40° to 65°C (–40° to 149°F)
AC Adapter
Input voltage 90–264 VAC
Input current (maximum) 1.5 A
Input frequency 47–63 Hz
Output current 3.5 A
Output power 70 W
Rated output voltage 20 VDC
Dimensions:
Height 27.94 mm (1.1 inches)
Width 58.42 mm (2.3 inches)
Depth 130.80 mm (5.15 inches)
Weight (with cables) 0.4 kg (0.9 lb)
Temperature range:
Operating 0° to 35°C (32° to 95°F)
Storage –40° to 65°C (–40° to 149°F)