We have smartphones that can achieve anything on the go. They’ve freed us from the need to carry around a map, dictionary, camera and basically a full-blown PC. But the thing that has continued to haunt these devices is their battery handicap.

As soon as the battery sign hits the dreaded red colour, its time to cut all operations. And sadly, for most of us this happens midway, through the day. The only upside to this miserable tale is that it has given birth to a whole new industry. Meet the power banks. Nearly all major companies have launched their own portable packs that help our smartphones survive a whole day and more.

To help you decide which one to pick [...]