My only concern would be that ones with a high energy density (kw-h/kg) might spontaneously catch fire, and I do not know of any reviews that address this issue (I think these would all be Li-iion, and you are not allowed put these in your checked baggage).

Nailed it!

That is also our concern. And why we are looking for actual travelers who have used such a device in practice.

Thanks again!

Peter Wieck
Melrose Park, PA