Dell Precision 7740 Setup and specifications guide

Battery

Table 1. BatteryBattery
Features	Specifications
Type	64 WHr Lithium ion Polymer 4 cell battery with ExpressCharge 97 WHr Lithium ion Polymer 6 cell battery with ExpressCharge 97 WHr Lithium ion Polymer 6 cell battery with three year warranty
Dimension	64 WHr "smart" lithium-ion Length - 222.40 mm (8.76 in) Width - 73.80 mm (2.90 in) Height - 11.15 mm (0.44 in) Weight - 298.00 g 97 WHr "smart" lithium-ion Length - 332.00 mm (13.07 in) Width - 73.80 mm (2.90 in) Height - 11.15 mm (0.439 in) Weight - 445.00 g
Weight (maximum)	64 WHr - 2.98 kg (0.66 lb) 97 WHr - 4.45 kg (0.98 lb)
Voltage	64 WHr - 7.8 VDC 97 WHr - 11.4 VDC
Life span	300 discharge/recharge cycles
Charging time when the computer is off (approximate)	4 hours
Operating time	Varies depending on operating conditions and can significantly reduce under certain power-intensive conditions
Temperature range: Operating	0°C to 35°C (32°F to 95°F)
Temperature range: Storage	-40°C to 65°C (-40°F to 149°F)
Coin-cell battery	ML1220