In reply to ON6DSL:
For info - A nice bat-pack I have be interested in
Industrial version of the Portable lithium ion battery pack Battery Power Station weighs only 1 pound with output 5V , 5.5V , 6V , 6.5V , 7.5V , 8.4V , 9V , 10V , 11V , 12V , 13V , 14V , 15V , 16V , 18V , 19V
I learned the hard way that this type of battery pack is not very nice for radio work. They contain DC-DC converters which generate QRM. I didn’t have this exact model but it looks very similar. A ferrite ring in the power lead helps a lot but I was never able to eliminate the noise completely.
To be fair though, other people have had them and reported no problems.
I’d be very wary of anything with variable output voltage. The last thing you want on a summit is a power supply which radiates broadband hash.