Tweaked Portable power

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http://forum.xda-developers.com – I was looking for a portable power source for my tablet. Most of the reviews for these devices are not too good and I believe the batteries used are mostly the reason they are not reliable. I bought two Chinese units called Power Bank with a capacity of 13800mah. I charged them to capacity and after charging the tab from 30% back to 100% they were nearly empty. Since the Tab has a battery rated at 4000mah this does not seem correct. One unit had five 18650 cells in parallel and the other unit had two square cells tied together. I tested both battery packs and they were not near the rat (HowTos)