WEBVTT

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so imagine this you got a hot date who's hanging onto your every word and she's

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asking you what's next on the docket for the evening you bust out your phone to

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get directions to an incredibly romantic used video game shop and suddenly you

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notice it's deader than your last relationship you start to panic but

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suddenly your date pulls out her phone holds it against yours and what you

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initially think is some kind of weird courtship ritual but then you see that

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your phone is working again thanks to wireless power sharing so you

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immediately have two thoughts one she's a keeper and two

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how in the heck does wireless power sharing work well we explained the basic principle

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behind wireless charging in general in our previous video on distance charging

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which you can check out up here but the idea is that when you run a current

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through a coil of wire and bring it close to another coil of wire a physical

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phenomenon called electromagnetic induction induces a current in the

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second coil this is how regular wireless chargers work including the relatively

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common qi chargers and even electric toothbrushes but what makes wireless

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power sharing different so the biggest difference is that your phone ends up

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charging another device directly from its main battery up until now

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traditional wireless charging has used a base station that's plugged into a wall

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outlet or it's taken the form of a wireless battery bank the advantage to

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wireless power sharing is that you don't need any extra equipment like an

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external charger or a power bank and the phone itself doesn't even have to be any

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larger it simply uses a small induction coil built into the phone's body

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currently the most well-known phone that features this technology is the samsung

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galaxy s10 which can not only power up the company's galaxy watch and galaxy

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buds but also any other phone that supports qi charging now reportedly the

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recently launched iphone 11 lineup also contains the hardware to support

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wireless power sharing but apple has disabled the feature for now for reasons

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that aren't totally clear perhaps the performance wasn't up to scratch

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indeed wireless power sharing does come at a rather steep energy cost in a best

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case scenario current technology will provide around 500 milliamps of current

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which isn't all that much so if you're trying to charge a smartphone with a 3

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500 milliamp hour battery that means it would take roughly three and a half

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hours just to get the charge up to 50

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however the galaxy s10 reportedly loses around one quarter of its battery life

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for every hour that it has wireless power sharing enabled so you shouldn't

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expect to get anywhere even close to fully charging another phone anyway

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wireless power sharing is pretty inefficient in that less than half of

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the power used up by one battery will wind up in the other battery so right

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now the technology is best suited for quick top-ups when you need a second

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phone to just work for a short period of time or if you're charging up less

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power-hungry devices like smart watches however as phone battery technology

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progresses we may end up seeing more robust wireless power sharing solutions

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for now it's a good way to keep you going in a pinch so you can think of it

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as like an energy drink for your phone that hopefully won't give it the jitters

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