This video, which half the people on the internet seem to think is a fake, hopefully demonstrates the battery tech of the future. It's a bio-organic system that uses a battery full of 2.1 nanometer crystals to... make a phone work.
It's impressive to watch (if you're not in the FAKE camp), although a bit less impressive at the end of the clip, when the demonstrator from developer StoreDot reveals a large black lumpy thing stuck on the back of the phone.
The reason it's supposedly fake according to conspiracy theorists is because the stopwatch app obscures the Android notifications tab and therefore the phone's own battery status indicator. We'd imagine that's because Android isn't used to a battery charging itself in 30 seconds, so it might not make for such a thrilling presentation.
As for when you might see a slimmer version in a consumer thing, company founder Dr Dorn Myersdorf told the BBC: "We think we can integrate a battery into a smartphone within a year and have a commercially ready device in three years." [BBC]