YES, the Portable Outlet 155W is allowed on Commercial Airlines, only in "Carry-on baggage".
The Portable Outlet CPAP Battery has been selling in North America since June 2017. In that time we have sold thousands of our 155W Lithium-ion batteries through hundreds of Home Medical Equipment and online dealers. Since we began, we have never been notified that a Portable Outlet battery was refused on any domestic or worldwide commercial flight.
Our battery has been tested by the Attestation of Global Compliance, an internationally recognized testing laboratory. We have a certified UN38.3 Test Report that our Lithium-Ion battery meets all international transportation guidelines. This is named for the 38.3rd section in the Manual of Tests and Criteria created by the Committee of Experts of the United Nations Transport of Dangerous Goods. These tests include Altitude Simulation, Thermal Testing, Vibration, Shock, External Short Circuit, Impact, Overcharge and Forced Discharge.
Since the Portable Outlet is a 155 Watt Battery, it follows rules designated for Lithium-ion batteries between 101 and 160 Watts:
They ARE allowed on commercial flights in "Carry-on Baggage" only.
There is a limit of TWO allowed per passenger on each flight.
Lithium-ion batteries are NOT allowed in luggage placed in the airplane's cargo hold.
Other restrictions apply. For example, a battery may be denied on a flight if it is cracked or damaged. We know most CPAP battery users have concerns about taking a Portable Outlet on a domestic or international flight. That is why we make the following promise...
If your Portable Outlet is confiscated by airline or airport staff, we will replace that Portable Outlet for free.*