Dell XPS RW491 Owner's Manual page 170

Battery
Type
Dimensions:
Depth
Height
Width
Weight
Voltage
Charge time (approximate)
Computer off
Operating time
Life span (approximate)
Temperature range:
Operating
Storage
Coin-cell battery
170
Specifications
9-cell "smart" lithium ion
6-cell "smart" lithium ion
67.6 mm (2.66 inches) (9 cell)
47.5 mm (1.87 inches) (6 cell)
20.4 mm (0.8 inch)
209.9 mm (8.26 inches)
0.48 kg (1.06 lb) (9 cell)
0.33 kg (0.7 lb) (6 cell)
11.1 VDC
:
4 hours
Battery operating time varies depending on
operating conditions and can be significantly
reduced under certain power-intensive
conditions (see "Power Problems" on
page 110).
See "Using a Battery" on page 49 for more
information on battery life.
300 discharge/charge cycles
0° to 35°C (32° to 95°F)
–40° to 65°C (–40° to 149°F)
CR-2032