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What does a ‘Battery Empty Attach Plug’ message mean?

This message is displayed on Inogen oxygen concentrators. The concentrator has insufficient battery power to produce oxygen. Attach an external power supply or exchange the battery for a charged one. Then restart the unit if necessary by pressing the On/Off button.

This is a high-priority alert message and is accompanied by a five beep pattern repeated every 10 seconds, and a flashing red light.