[jhynesrockmtn]

I just had a bad experience with these style of packs. I was at a friends funeral and must have left the accessory feature on when I went back to close the windows. Two attendees came with this size of jumper pack that were fully charged. Neither one did anything but a brief engagement of the starter. A guy came over with good old fashioned jumper cables that did the trick right away. Now, I don't know the brand and they looked similar to each other so there may be brands of these that work well but my limited experience was not good.