Dell Latitude E5420 (Early 2011) - Manual (Page 147)

Battery
4-cell 14.8 VDC
6- and 9-cell 11.1 VDC
Temperature range:
Operating 0 °C to 50 °C (32 °F to 122 °F)
Non-Operating –40 °C to 85 °C (–40 °F to 185 °F)
NOTE: The battery pack is capable of safely
withstanding the above storage temperatures with
100% charge.
NOTE: The battery pack is also capable of withstanding
storage temperatures from –20 °C to +60 °C with no
degradation in its performance.
Coin-cell battery 3 V CR2032 lithium coin cell
AC Adapter
Input voltage 100 VAC to 240 VAC
Input current (maximum) 1.5 A, 1.6 A, or 1.7 A
Input frequency 50 Hz to 60 Hz
Output power 65 W or 90 W
Output current 65 W 90 W
3.34 A (continuous) 4.62 A (continuous)
Rated output voltage 19.5 +/– 1.0 VDC
Dimensions
65 W 90 W
Height 16.00 mm (0.63 inch) 16.00 mm (0.63 inch)
Width 66.00 mm (2.60 inches) 70.00 mm (2.76 inches)
Length 127.00 mm (5.00 inches) 147.00 mm (5.79 inches)
Temperature range:
Operating 0 °C to 40 °C (32 °F to 104 °F)
Non-Operating –40 °C to 70 °C (–40 °F to 158 °F)
Physical
Height
Latitude 5420/E5420/E5420m 29.90 mm to 32.50 mm (1.18 inches to 1.28 inches)
Latitude 5520/E5520/E5520m 30.20 mm to 33.20 mm (1.19 inches to 1.31 inches)
Width
147