Dell Latitude 7640 Technical Manualbook page 18

Table 16. Battery specifications (continued)
Description
Height
Width
Depth
Temperature range:
Operatin
g
Storage
Battery operating time
Battery charging time
(approximate)
NOTE: Control
the charging time,
duration, start and
end time, and so on
using the Dell Power
Manager application.
For more information
about Dell Power
Manager, search
in the Knowledge
Base Resource
at www.dell.com/
support.
Coin-cell battery
18 Specifications of Latitude 7640
Option one
6.30 mm (0.24 in.)
210.97 mm (8.30 in.)
79.80 mm (3.10 in.)
● Charge: 0°C to
45°C (32°F to
113°F)
● Discharge: 0°C to
70°C (32°F to
158°F)
-20°C to 65°C (-4°F
to 149°F)
Varies depending on
operating conditions
and can significantly
reduce under
certain power-intensive
conditions.
Express Charge
Method:
● 0 - 15°C maximum
allowable charge
time from 0 to 100%
RSOC is 4 hours
● 16 - 45°C normal
express charge
● 46 - 50°C maximum
allowable charge
time from 0 to 100%
RSOC is 3 hours
Standard Charge/
Predominately AC
User Charge Method:
● 0 - 15°C maximum
allowable charge
time from 0 to 100%
RSOC is 4 hours
● 16 - 50°C maximum
allowable charge
time from 0 to 100%
RSOC is 3 hours
Express Charge Boost
Charge Method (Fast
Charge for Initial
35%):
● 16 - 45°C target
charge time from 0
to 35% RSOC is 20
mins for Accelerated
Charge
Supported
Option two
6.30 mm (0.24 in.)
254.8 mm (10.03 in.)
79.8 mm (3.10 in.)
● Charge: 0°C to 45°C
(32°F to 113°F)
● Discharge: 0°C to
70°C (32°F to 158°F)
-20°C to 65°C (-4°F to
149°F)
Varies depending on
operating conditions and
can significantly reduce
under certain power-
intensive conditions.
Express Charge
Method:
● 0 - 15°C maximum
allowable charge time
from 0 to 100% RSOC
is 4 hours
● 16 - 45°C normal
express charge
● 46 - 50°C maximum
allowable charge time
from 0 to 100% RSOC
is 3 hours
Standard Charge/
Predominately AC User
Charge Method:
● 0 - 15°C maximum
allowable charge time
from 0 to 100% RSOC
is 4 hours
● 16 - 50°C maximum
allowable charge time
from 0 to 100% RSOC
is 3 hours
Express Charge Boost
Charge Method (Fast
Charge for Initial 35%):
● 16 - 45°C target
charge time from 0 to
35% RSOC is 20 mins
for Accelerated Charge
Supported
Option three Option four
6.30 mm (0.24 in.) 6.30 mm (0.24 in.)
210.97 mm (8.30 in.) 254.8 mm (10.03 in.)
79.80 mm (3.10 in.) 79.8 mm (3.10 in.)
● Charge: 0°C to ● Charge: 0°C to
45°C (32°F to
113°F)
● Discharge: 0°C ● Discharge: 0°C
to 70°C (32°F to
158°F)
-20°C to 65°C (4°F -20°C to 65°C (4°F
to 149°F) to 149°F)
Varies depending Varies depending
on operating on operating
conditions and can conditions and can
significantly reduce significantly reduce
under certain power- under certain power-
intensive conditions. intensive conditions.
Express Charge Express Charge
Method: Method:
● 0 - ● 0 -
15°C maximum
allowable charge
time from 0 to
100% RSOC is 4
hours
● 16 - 45°C normal ● 16 - 45°C normal
express charge
● 46 - ● 46 -
50°C maximum
allowable charge
time from 0 to
100% RSOC is 3
hours
Standard Charge/ Standard Charge/
Predominately AC Predominately AC
User Charge User Charge
Method: Method:
● 0 - ● 0 -
15°C maximum
allowable charge
time from 0 to
100% RSOC is 4
hours
● 16 - ● 16 -
50°C maximum
allowable charge
time from 0 to
100% RSOC is 3
hours
Supported Supported
45°C (32°F to
113°F)
to 70°C (32°F to
158°F)
15°C maximum
allowable charge
time from 0 to
100% RSOC is 4
hours
express charge
50°C maximum
allowable charge
time from 0 to
100% RSOC is 3
hours
15°C maximum
allowable charge
time from 0 to
100% RSOC is 4
hours
50°C maximum
allowable charge
time from 0 to
100% RSOC is 3
hours