Dell Latitude 5420 Owner's Manual page 219

Temperature
range:
Operating 0 °C to 50 °C (32
°F to 122 °F)
Non- –40 °C to 85 °C (–
Operating 40 °F to 185 °F)
Coin-cell 3 V CR2032
battery lithium coin cell
AC Adapter
Input voltage 100 VAC to 240 VAC
Input 1.5 A, 1.6 A, or 1.7 A
current
(maximum)
Input 50 Hz to 60 Hz
frequency
Output 65 W or 90 W
power
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.