1 battery operated oxygen concentrator 2 for health care use ... Wight: Generating unit: adapter 2.0KGGenerating unit+adapter+lithium battery (15V, 4A) +charger 2.4KG Power Consumption: ... machine can keep working 8 hours, not the battery, battery can work 60-80 minutes. Dimensions: 200 x ... en.alibaba.com/ 2012 hot sale mini battery operated oxygen concentrator(3L),rechargable battery operated,CE approved