Same here (well, different model–26k and 87W–but same strategy). Even just as a backup in case of unexpected travel hiccups, a large (airline approved) PD-capable battery back is very handy to have. I never worry about finding an outlet in an aircraft or airport, and I’ve spent my fair share of time stranded in transit.
Not funny once you realize all doctors are actually lizard people in human skin suits performing experiments on us. QED sucker!