I cry foul on those photos stretched to make the battery pack look thinner than it is!
Specs say 0.5 in thick by 2.5 in wide. That would be a ratio of 0.2 thickness to width.
Measuring the device shown in the photo yields a ratio of 0.13.
Slimy fake promotion.
BTW, not buying any lame, the photos accidentally got stretched thinner on the web page excuse. Anybody looking at those photos and those specs can see a problem.