I really love my EarthX airplane battery and now I see EarthX is selling a very compact, lightweight Jump Pack using their safe lithium-iron battery technology. It is $130, which is not a bad price, but in looking at the specs it is only rated for 200 cranking amps, 400 amps peak. Most other jump packs for sale are at least twice this capacity or more. My question is: has anyone bought one of these, and will it actually crank and start a Rotax uls if the on-board battery is dead? If so, I think I will buy one because of its safer technology; nearly all other jump packs use the more dangerous litium-ion technology.