A mobile phone that does it without battery: American scientists have been built alone. He takes his energy out of light and radio waves, and you can really call it.

Mobile phones are true wipes, but the battery is clearly the weak point. You need to charge them again, and at the end of the day, you'll often have a good phone with a sudden drop out of battery: battery is empty. American engineers have now developed a mobile phone that basically always does it because it does not need a battery at all.

The device consists entirely of parts that are just in store for sale and are able to establish conversations via Skype. The tiny amount of energy he needs for it - we are talking about microwatts - he extracts from his immediate environment, namely, in the air, radio signals or light.

The new technology is described in detail in the scientific magazine with perhaps the longest name ever: Proceedings of the Association for Computing Machinery on Interactive, Mobile, Wearable and Ubiquitous Technologies.

Battery-free cellphone

Exit energy slipper

In order to get the phone working, the engineers eliminated an important energy slider: the conversion of the analogue audio signal into digital data. That process consumes so much power that it's impossible to have a place in a phone without battery. Instead, this phone converts speech patterns into radio signals in a way that does not cost a lot of power.

It may be clear that you can not run What's App or Google Maps on this mobile. In fact, he has no display or digital memory at all. At the earliest, a future version should be able to stream video on an e-ink display with a very low energy requirement.

Always call, even if your phone is empty

But despite the limited functionality, there are applications for this new technology. For example, if you were to install the technology by default in Wi-Fi routers, you could basically call almost anywhere with a battery-free phone. It is also conceivable that you install the technology in a standard smartphone, so you can still call an empty battery. Or maybe everybody has a phone without battery in a car in a few years. An outcome now that the yellow talkpoints along the roads have disappeared, you can even call for help if your smartphone is empty.