Dell Axim X51 Owner's Manual page 133

Power Supply
Battery type:
Main
Backup
AC adapter:
Supply voltage
Frequency
Current consumption
Output voltage
Output current
Environmental
Temperature range:
operating
storage
Thermal gradient:
operating
storage
Relative humidity (maximum):
operating
storage
1100-mAh lithium-ion removable,
rechargeable battery (standard)
2200-mAh lithium-ion removable,
rechargeable battery (optional)
Capacitor to preserve RTC data
100–240 VAC
50–60 Hz
0.4 A
5.4 VDC
2.41 A
0° to 40°C (32° to 104°F)
–20° to 60°C (–4° to 140°F)
15°C (59°F) per hour maximum
20°C (68°F) per hour maximum
10% to 90% non-condensing
5% to 95% non-condensing
Appendix 133