Specifications
Heat output
Approximately 48 Kcal per hour
Electrical (AC Adapter)
Sine-wave input, at 50 to 60 Hz is required
The input rating of the AC Adapter: 100–240 V ac, 50/60 Hz
Battery pack
Nickel Metal Hydride battery pack
Nominal voltage: 9.6 V dc
Capacity: 4.0 AH
Lithium-ion battery pack
Nominal voltage: 10.8 V dc
Capacity: 4.8 AH
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ThinkPad 390X User's Reference