These days the mobile phone battery last less than a day if you use it intensively, so you need backup battery to charge your mobile device on the go. We have chosen some of the best power banks for you based on the technology, weight, design and charging speed. Some of these brands are available only in US, most of the power banks are chinese products and branded by US companies. In Europe you may find the same products under a different name.
Self Charge Time
Most Li-Ion batteries have 20-30% less capacity than the specified capacity because of the differences in cells. Li-Polymer batteries have a better capacity, only 10%-20% less than the specified capacity.