Storedot boss Doron Myersdorf shows off his fast-charging battery device

I've just been witness to what feels like a modern-day technological miracle.

A Samsung smartphone has just been recharged from being nearly out-of-juice to full capacity in less time than it takes to boil a kettle.

The Israeli start-up behind the demo, Storedot, has shown off a similar feat before.

But a previous demo posted online eight months ago involved a battery many times thicker than the handset itself as well as an outsized charger - making the tech impractical for real-world use.

This time round the phone involved is no bigger than normal, and the charging dock is pretty slim-line as well.