[Elecraft] [OT] Jump starter system for K3 portable power?

[rick jones]

I'm looking for one of those hand carried jump starter/ portable power units for occasional field use for my K3 plus the rare car jump start in a pinch. Ultimately I would like it to have a replaceable battery, real three state charger that allows it to be plugged in at all times, high current output lugs (not just 12v jack), built in jumper cables, light enough to carry short distances, made in USA! OK that's a tall order! Do you know of a brand and model that covers many or most of these requirements? MOST of the dozens on Amazon do not appear to have the quality I prefer and are throw away, consumer grade units. I do like the looks of the Schumacher ProSeries chargers (22 amp hours or so). If I fail in my quest I'll consider a West Mountain Radio setup that I can lug out to the car if necessary for field use, camping, jump starting etc.. The up side is that Power Poles are standard! PS: I am aware of the amp-hours vs. power output vs. operating time vs. weight aspect of making a selection. I believe not getting a hernia will ultimately define the capacity of whichever unit I choose! Thanks for reading!