Minor nit: They are electrically compatible, that's why the M5P will power up, take off, and fly. Unfortunately they do not have sufficient power to operate the drone under all conditions.
Perhaps there will be a firmware update in the future...
Thank you, again. The coordinates led me to it and after poking around in the snow, success. Knocked off the snow and ice, Dried it off, and installed a fresh battery. Good to go!!
Title says it all, yes I know its a bit early, but I would like to warn all of you out and about flying your drones, just be mindful of these guys on Christmas Eve.