Yes the ' Power tanks ' are sexy and have all the bells and whistles but as said ,,,,
they are very pricey .
I have one of these , from ' Supercheap Auto ' and touch wood , its been used and abused for 13 years now and still going strong , it's even cranked a few cars in that time .
It has 2 USB ports , a Ciggy plug , light and of course jump starter cables .
$49 in the day , don't know what they are worth now but I can guarentee they are less than a PT , one thing I do with mine is charge it about every 3 months , good value item .
.
I have talked to Jaycar and they sell replacement batteries for these and an easy job to replace ,, but hey
13 years aint to shabby and in that time its run HEQ5's , EQ6's , an Iopron IEQ45 and now a beast of a CI700 .
Brian.