I have an Antigravity XP10. When I bought it, it was the best on they market although kind of pricey. Jumpers have come down in price and up in power since them. Mine is supposed to turn over a diesel up to 7.3L. I've never had a chance to try it on a diesel but it sure starts a can engine nicely. They're sure a big improvement of the suitcase sized jumpers we had for so many years.
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I bought one a couple years ago when I bought my wife an overpowered snowmachine that could not be pull started. ( Arctic Cat 1100 Turbo). and as an auxillary for my Ram 3500 5.9 Cummins diesel - she carries a big bulky thing in her Expedition. Which will inflate tires, as well.
Purchased the XP10 in case the snow machine battery ever wend dead out of town... never did. But it carried nicely under my parka, where it stayed warm and fully capable. I did use the XP10 to start someone's car once, and did carry it traveling and used it at to the cabin last summer to keep the ipad and iphones charged when other power was not available.
Dunno what they are now, but I paid about 150 then.