Dell Alienware M14x R2 (Early 2012) - Manual (Page 6)

Power adapter
Type 150 W
Input voltage 100–240 VAC
Input current (maximum) 2.50 A
Input frequency 50 Hz–60 Hz
Output current 7.70 A
Output power 150 W
Rated output voltage 19.50 +/- 1 VDC
Temperature range
Operating 0 °C to 40 °C (32 °F to 104 °F)
Storage –40 °C to 70 °C (–40 °F to 158 °F)
Battery
Type 8-cell “smart” lithium ion (63 WHr)
Height 11.20 mm (0.44 inch)
Width 173.00 mm (6.81 inches)
Depth 109.40 mm (4.31 inches)
Weight 0.43 kg (0.95 lb)
Voltage 14.8 VDC
Operating time battery operating time varies depending on
operating conditions and can reduce significantly
under certain power-intensive conditions.
Life span (approximate) 300 discharge/charge cycles
Temperature range
Operating 0 °C to 50 °C (32 °F to 122 °F)
Storage –20 °C to 60 °C (– 4 °F to 140 °F)
Coin-cell battery CR-2032