Dell XPS 11 (9P33, Late 2013) - Manual (Page 6)

Battery
Type 4 cell
Dimensions:
Height 0.13 in to 0.22 in (3.30 mm to 5.68 mm)
Width 10.63 in (270 mm)
Depth 4.57 in (116 mm)
Weight (maximum) 0.48 lb (0.22 kg)
Voltage 7.40 VDC
Charging time (approximate) within 4 hours at 25 °C
Operating time Varies depending on operating conditions and
can significantly reduce under certain power‑
intensive conditions.
Life span (approximate) 300 discharge/charge cycles
Temperature range:
Operating 0 °C to 35 °C (32 °F to 95 °F)
Storage –20 °C to 65 °C (–4 °F to 149 °F)
Coin‑cell battery CR‑2016
Power Adapter
Type 45 W
Input voltage 100 VAC–240 VAC
Input frequency 50 Hz–60 Hz
Input current 1.30 A
Output current 2.13 A
Rated output voltage 19.50 VDC
Temperature range:
Operating 0 °C to 40 °C (32 °F to 104 °F)
Storage –40 °C to 70 °C (–40 °F to 158 °F)