An electric car will require a little more than a simple wi-fi connection to charge ;)

I always wondered about using kinetic energy from the wheels turning to charge the battery in electic cars, it could run forever depending on how much electricity could be generated from wheel turning.

kinetic energy from the wheels is already used to charge batteries in hybrid cars.  the car won't move forever but it is the reason why hybrid cars get pretty much the same milage in city as they do on highway, much of the losses do to braking is recovered. 

OT - pretty cool tech, is there any word on the efficiency of charging a battery in this manner?

Holly shit RCA developed this, that is amazing in its self, maybe they will become a decent brand again.

http://www.youtube.com/watch?v=jwBGSm-Hl5A
It's been pointed out that it's not new tech. Yes Tesla was the first to come up with this amazing tech. There are numerous videos on Youtube that display and explain how this works. I will sumerize though.

Electrons are "accelerated" up to the levels of a radio frequency(no BlueTooth or WiFi protocols). This essentialy makes the overload of electron particles floating about on the radio waves safe. In simple examples ALL metal will pick up on the frequency and ground the electrons.

What RCA has done is manage to get the electron particles onto a specific low range fequency similar to those you can find on portable radio transimtable CD/MP3 players. We are talking in 2-4 meter range. They probably also managed to get it to the point where not all electrical devices/metal will pick this up. Just the RCA elctron frequency receiver.

This is not a battery as it is a wireless cord, similar to how WiFi is a wireless ethernet. I'm not saying there isn't some battery form inside. Likely there is so that control of electrical flow is possible or to if the electron amount is so low that it does "charge" the battery, but it really shouldn't be thought of like a battery.

Finally it's also likely that RCA built in numerous failures to make sure that you will have to buy them often. The reason the tech never went forward wasn't that it didn't work. It was that the electrical companies that were funding it found out there was no way to monitor consumption and thus never figure a way to make profit. 100 years of lost tech for the purpose of greed.

Edit: need to say this

WiFi and BlueTooth are not wireless technology. They are radio protocols for analog to digital communications. WiFi and BlueTooth still use the radio wave frequency for data tranmission. They are radio transmitors and recievers. They are still radio technology.

I was just reading about how it takes only 20 mW to keep a cell phone in standby indefinitely and 50 mW to get a good charge out of it. A lot of people are doing the "math" online and say it's impossible but they're not the ones working on this technology therefore they're no experts on the subject.

Back in June Nokia claimed they could get a 5mW charge in a similar manner. It's not too hard to believe that the technology has been improved to the point where at least 20 mW is feasible which is good enough for me since 90% (at least) of the time my phone is in standby anyway.

Now let's say that only 20 mW will be possible using this technique well here's some math for you all out there. 1 minute of talk time equals 12.5 minutes in standby time (remember that). If you use 200 minutes a month (you may have more each month but studies show most people under use their minutes) that only equals 6.66 minutes a day. Let's round that up to 7 (why? because it makes the math easier lol). Seven minutes of talk time equals 175 minutes of standby or 2.92 hours. Let's round that up again to 3. You with me so far?

Now let's say you charge your phone once every two days (When it drains completely). All this means is that for every 14 minutes of talk time, you charge your phone for 42 hours of standby time. Now with a 20 mW charge we eliminate the need to charge your phone for all that time in standby.

Easy to understand right? Let's do some more math. 42 hours multiplied by 60 is 2520 minutes. Divide that by 12.5 to get talk time instead of wasted standby time and you have 201.6 minutes! That's a whole month of minutes! I doubt you'd talk more just because you got more battery life so when it's all added up you'd only need to wall charge your phone only once a month!

I hope you got all that since i have an easier time understanding math than explaining it sometimes. Also I haven't done any sort of heavy math in like 5 years so my numbers could be wrong. It's up to you to prove or disprove my numbers yourself if you don't feel they add up.

I thought this was pretty cool too.

"How many times were you left frustrated trying to change the channel on the TV
just to realize that the batteries are dead. Of course there are no more batteries in the house so you are forced to steal the batteries from a lesser used remote. Even more frustrating is when you need to use the remote that had the batteries robbed out of them. This problem may be a thing of the past, there is finally a remote control that is charged by picking it up and using it! Motion is what charges this cool unit."

http://hackedgadgets.com/2009/11/18/remote-control-that-does-not-use-batteries/

I KNEW THAT SHIT WAS BATTERY ACID!