Dell Inspiron 15R (5520, Mid 2012) - Manual (Page 6)

Battery
Inspiron
14R-5420/7420/
M421R-5425 Inspiron
15R-5520/7520/
M521R-5525
6-cell “smart” lithium ion
Height 20 mm (0.79 inches) 20 mm (0.79 inches)
Width 208 mm (8.19 inches) 208 mm (8.19 inches)
Depth 51 mm (2.00 inches) 51 mm (2.00 inches)
Weight 0.33 kg (0.73 lb) 0.33 kg (0.73 lb)
Voltage 11.1 VDC 11.1 VDC
Charge time
(approximate) 4 hours (when the
computer is turned off) 4 hours (when the
computer is turned off)
Operating time battery operating time
varies depending on
operating conditions
and can be significantly
reduced under certain
power-intensive
conditions battery operating time
varies depending on
operating conditions
and can be significantly
reduced under certain
power-intensive
conditions
Coin-cell battery CR-2032 CR-2032
Power adapter
Inspiron
14R-5420/7420/
M421R-5425 Inspiron
15R-5520/7520/
M521R-5525
Type 65 W
(Inspiron 14R-5420/7420)
90 W (Inspiron
14R-5420/7420, Inspiron
M421R-5425) 65 W/90 W
Input voltage 100-240 VAC 100—240 VAC
Input current (maximum) 1.50 A/1.60 A/2.50 A
(Inspiron M421R-5425)
1.50 A/1.60 A/1.70 A/
2.50 A (Inspiron
14R-5420/7420)
1.50 A/1.60 A/
1.70 A/2.50 A
Input frequency 50-60 Hz 50—60 Hz