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How does it work?

To put it simply, these portable chargers are basically just batteries that have been added with circuits and casing in order for them to charge the batteries of other devices. The much earlier power banks tend to have weaker batteries. However, with the coming of li-ion and li-polymer batteries, mobile chargers now have bigger power capacities of 
power bank online

Are they safe to use?

Of course, other than making sure that these batteries, circuits, and cables can do the trick, these mobile chargers were designed to function safely. Added safety nets are the various certifications that some power banks have that attest to their quality. These quality control measures do not just ensure that these gadgets are safe to use for devices but also vouches that the power bank will not accidentally self-destruct.