I purchased a thunder jump start pack a couple of weeks ago for work.This morning went to start the dyna the battery was dead.sliped off battery cover and hooked up jump pack bang away she went!cheaper ones on the market this one cost me $240 but worth having one in the saddle bags.
I have always rubbished them- until i used one at work to start a dead flat AU falcon ute. The battery was so dead, it would nt even click. The little jumper pack turned it over 5 times till it fired up. Dunno how good theyde be on hi comp diesels or V8s......