If you have ever seen one of this portable jump start power packs in action it would make anyone a believer. Sit in the trunk of your car for lord knows how long and then asif by magic it stars a dead batteried car.
Or not. No way of testing these easily - I had 1 that claimed to support “up to a V6 car engine” but couldn’t turn over the S&S when I needed it to / 1st Banner failed. Replaced this with the biggest one I could find (indeed too much Lithium for normal courier service!). That failed as the battery connector was faulty (although worked fine when I used it with the -fortuitously compatible- 1st pack’s connector). Caveat emptor on those things, but their performance did persuade me to swap out my own battery for a Li based one…
