Dell XPS 15 (L521X, Mid 2012) - Manual (Page 5)

Touchpad
X/Y position
resolution
(graphics table
mode) 240 cpi
Size (sensor-active
area)
Height 71.50 mm (2.82 inches)
Width 99.00 mm (3.90 inches)
Battery
9-cell “smart” lithium
ion
Height 13.80 mm (0.54 inch)
Width 247.80 mm (9.76 inches)
Depth 101.20 mm (3.98 inches)
Weight 0.43 kg (0.95 lb)
Voltage 11.1 VDC
Charge time
(approximate) less than 4 hours (when the computer is turned off)
Operating time battery operating time varies depending on operating
conditions and may reduce significantly under
certain power-intensive conditions
Coin-cell battery CR-2032
AC Adapter
Type 90 W
Input voltage 100 VAC—240 VAC
Input current
(maximum) 1.60 A/1.70 A
Input frequency 50 Hz—60 Hz
Output current
(continuous) 3.34 A/4.62 A
Output power 90 W
Rated output voltage 19.50 +/- 1 VDC