Can this adapter (these components) be used to power a camera from the cigarette lighter of an automobile?
I do not believe the AC128 AC Adapter can be powered from a cigarette lighter of an automobile. The usual connectors to that outlet are adapters that power a 5 volt USB connection to phones, tablets, etc. The auto adapter is a 5 volt adapter;but the AC128 is an 8.3 volt adapter.and the "battery" part is rated 8.3 volts also. It is interesting however that there is a connector about 9 inches from the "battery" end that hints that some other adapters might be in the works, or perhaps that the AC part of the device swaps out to other power sources. Nothing in the minimal documentation addresses that idea however.
It would certainly be nice if Pentax/Ricoh would recognize the need for an automobile-powered charger or adapter but they haven't as far as I know.
I hope this helps.