FAA/TSA restrictions that Lithium-ion batteries with a watt-hour rating (Wh) of 100Wh or less are allowed in carry-on baggage...
The ES960 CPAP battery has a capacity of 297.6Wh, which exceeds the FAA/TSA limit for carry-on batteries...
The ES720 CPAP battery has a capacity of 266.4Wh, which exceeds the FAA/TSA limit for carry-on batteries...
The ES400 AIR CPAP battery has a capacity of 148Wh...