Jon, just wanted to thank you for putting this together! I went with your suggestion of using the cigarette lighter power adapter for the Dreamstation into the Jackery E240. After over 8hours on the CPAP, I still had 70% juice left on the Jackery! I was a bit concerned before finding your article because most information I read about the Jackery E240 made it seem like it wasn’t the right choice for CPAP use. Thanks again!