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Free Energy for your phone or PDA

#5
Re: Free Energy for your phone or PDA

i wonder what the WIFI making companies would do then... limit range or have energy blocking wall coatings to stop people sniping their energy, making power bills go up hah.

sticks > spears > arrows > lead shot > engineered projectiles > lasers > energy stealing bastard wifi phone snipers!
 
#6
Re: Free Energy for your phone or PDA

I see big-oil burying this technology really fast due to the potential for it to be used in vehicles on a much larger scale.

Heck, it could be put in (right now) on a large scale and put into a big city like KC, Chicago, NY and you'd probably never need gas! I'm thinking a perfect public transportation resource in big cities.
 
#7
Re: Free Energy for your phone or PDA

Snake oil... I think you will be disappointed in the real-world performance of the Airnergy device.

A Motorola Razr cell phone transmitter can put out 1 watt and can last for 7 hours ("talk time"), according to online specs. An 811.g wifi transmitter puts out a maximum of 100 milliwatts (0.1 watts). If all of the output power of the wifi were converted to charging a Razr battery, it would take tens of hours to fully recharge a discharged Razr battery. However, the Airnergy device captures only a small fraction of the wifi energy (and the rate of energy harvesting decreases inversely with the square of the distance from the wifi antenna), so it would take even longer. More than one person has commented that the Airnery device "sounds too good to be true." Yep.

If the Airnergy device is ever produced, I believe it will contain a spare battery that will take a week or more to fully charge if very near a wifi transmitter. The energy will be "free" but you might have to buy a gallon of patience to use with it.
 
#9
Re: Free Energy for your phone or PDA

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: One-Eyed Jack</div><div class="ubbcode-body">Snake oil... I think you will be disappointed in the real-world performance of the Airnergy device.

A Motorola Razr cell phone transmitter can put out 1 watt and can last for 7 hours ("talk time"), according to online specs. An 811.g wifi transmitter puts out a maximum of 100 milliwatts (0.1 watts). If all of the output power of the wifi were converted to charging a Razr battery, it would take tens of hours to fully recharge a discharged Razr battery. However, the Airnergy device captures only a small fraction of the wifi energy (and the rate of energy harvesting decreases inversely with the square of the distance from the wifi antenna), so it would take even longer. More than one person has commented that the Airnery device "sounds too good to be true." Yep.

If the Airnergy device is ever produced, I believe it will contain a spare battery that will take a week or more to fully charge if very near a wifi transmitter. The energy will be "free" but you might have to buy a gallon of patience to use with it. </div></div>

Ever heard of inverters and amplifiers? I think this could work! its not designed to replace your existing charger, but to give you access to an alternate source of power for your mobile device if you are not near an outlet, Like in a coffee shop, mall, airport...well you get the point.
 
#11
Re: Free Energy for your phone or PDA

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: USMCj</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: One-Eyed Jack</div><div class="ubbcode-body">Snake oil... I think you will be disappointed in the real-world performance of the Airnergy device.

A Motorola Razr cell phone transmitter can put out 1 watt and can last for 7 hours ("talk time"), according to online specs. An 811.g wifi transmitter puts out a maximum of 100 milliwatts (0.1 watts). If all of the output power of the wifi were converted to charging a Razr battery, it would take tens of hours to fully recharge a discharged Razr battery. However, the Airnergy device captures only a small fraction of the wifi energy (and the rate of energy harvesting decreases inversely with the square of the distance from the wifi antenna), so it would take even longer. More than one person has commented that the Airnery device "sounds too good to be true." Yep.

If the Airnergy device is ever produced, I believe it will contain a spare battery that will take a week or more to fully charge if very near a wifi transmitter. The energy will be "free" but you might have to buy a gallon of patience to use with it. </div></div>

Ever heard of inverters and amplifiers? I think this could work! its not designed to replace your existing charger, but to give you access to an alternate source of power for your mobile device if you are not near an outlet, Like in a coffee shop, mall, airport...well you get the point. </div></div>

Inverters just exchange voltage for current and amplifiers use another power source to boost signals of a weak source....... can't do anything unless there is enough energy to start with.
One-eyed Jack's point is a good one.
CES is probably a good place to demonstrate this thing with hundreds of AP's operating all in the same building, but hardly representative of the Wi-Fi energy to be had anywhere else.

It literally could take a day or a week to charge a spare battery for your phone. You could easily drain a battery faster than it charges.
It would be cheaper and more reliable to just keep a spare battery handy, fully charged of course.
 
#12
Re: Free Energy for your phone or PDA

Great idea, hopefully it'll work somewhat well. I think that's why the device is so much bigger than the battery shown, it probably does have a built-in battery to hold any energy consumed.

Kinda like with solar power, you need batteries to hold the energy and disperse it to devices fast enough to run them.
 
#13
Re: Free Energy for your phone or PDA

Dodgy stuff. There is "energy" there but not enough to do this. You would need to be in a LARGE RF field for this to work, some place I wouldn't want to be an expect kids with one head or not die of cancer.

*****Edit
In the comments someone has done some of the maths on this scam. He has missed a few things but it's simply not possible for this device to work as they claim. It's a bit like saying a mouse in a wheel an power my house. It IS possible but it's going to be a VERY big mouse or a VERY small house.

"Here's some math. Long story short, by my calculations, 100% efficiency and absorption at 5 feet away from a 100mW home router, (reasonable figures), it would take 34.5 years to charge that blackberry battery.
It's not a Dyson Sphere, so you only get the power that hits the antenna.
Surface of a sphere = 4pir^2, r = 60" (5 feet).
Surface area of a 5' sphere = 45,216 square inches.
The device appears about 2" x 3" = 6 square inches.
The device then picks up, best case, 0.000133 of the power out from the router, which is 100mW, so.. 0.0133mW

If you leave it there for 24 hours, 0.0318 mWh are stored.
"

 
#14
Re: Free Energy for your phone or PDA

So just stand near a cell or radio tower
wink.gif

Three must be alot of energy in the air at airports I assume
 
#15
Re: Free Energy for your phone or PDA

(1) This scheme will work - slowly.

(2) Is it practical? Not very.

There are already devices which will recharge your phone battery with power from primary batteries. That's a lot more practical. So is a small solar panel. But who needs it? Not very many people.

It's an interesting gadget. That's all.

This is also an interesting gadget:

http://www.ted.com/talks/pattie_maes_demos_the_sixth_sense.html
 
#16
Re: Free Energy for your phone or PDA

Would it pick up additional RF from the computers communicating back to the router? Other cell phones? Other RF from big towers, etc? The phone itself?
I think I'll stick to my regular charger anyway. I'm driving my truck anyway, so charging there is "free".
Seems like they ought to stick a little solar panel of the batteries, to me.
CW
 
#17
Re: Free Energy for your phone or PDA

Lindy;
Sure it is very interesting.

A few people were talking like this was going to be of great benefit.
This was my reason for trying to state how impractical it is.

I had a layover in Atlanta over the holidays and most of the seating areas at the gate had rows of power jacks between the seats. A few minutes attached to one of them and I hit a full charge. I watched movies on my Droid phone during the flight(the first-class monitors were not functioning on my side of the plane) and used a AA-battery booster to bump my battery back up to 80% about halfway through.
 
#18
Re: Free Energy for your phone or PDA

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: One-Eyed Jack</div><div class="ubbcode-body">Snake oil... I think you will be disappointed in the real-world performance of the Airnergy device.

A Motorola Razr cell phone transmitter can put out 1 watt and can last for 7 hours ("talk time"), according to online specs. An 811.g wifi transmitter puts out a maximum of 100 milliwatts (0.1 watts). If all of the output power of the wifi were converted to charging a Razr battery, it would take tens of hours to fully recharge a discharged Razr battery. However, the Airnergy device captures only a small fraction of the wifi energy (and the rate of energy harvesting decreases inversely with the square of the distance from the wifi antenna), so it would take even longer. More than one person has commented that the Airnery device "sounds too good to be true." Yep.

If the Airnergy device is ever produced, I believe it will contain a spare battery that will take a week or more to fully charge if very near a wifi transmitter. The energy will be "free" but you might have to buy a gallon of patience to use with it.</div></div>

I think that you are expecting too much from a device like this. It is impractical to expect a 1st generation device like this to fully recharge a battery. For practical purposes, it will indeed extend the battery life of a cell phone. A phone with this device may indeed be drawing power from the battery at a greater rate than it is recharging, but the draw will be slowed down, hence increased talk time. I think it is a step in the right direction.
 
#22
Re: Free Energy for your phone or PDA

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: USMCj</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: One-Eyed Jack</div><div class="ubbcode-body">Snake oil... I think you will be disappointed in the real-world performance of the Airnergy device.

A Motorola Razr cell phone transmitter can put out 1 watt and can last for 7 hours ("talk time"), according to online specs. An 811.g wifi transmitter puts out a maximum of 100 milliwatts (0.1 watts). If all of the output power of the wifi were converted to charging a Razr battery, it would take tens of hours to fully recharge a discharged Razr battery. However, the Airnergy device captures only a small fraction of the wifi energy (and the rate of energy harvesting decreases inversely with the square of the distance from the wifi antenna), so it would take even longer. More than one person has commented that the Airnery device "sounds too good to be true." Yep.

If the Airnergy device is ever produced, I believe it will contain a spare battery that will take a week or more to fully charge if very near a wifi transmitter. The energy will be "free" but you might have to buy a gallon of patience to use with it. </div></div>

Ever heard of inverters and amplifiers? I think this could work! its not designed to replace your existing charger, but to give you access to an alternate source of power for your mobile device if you are not near an outlet, Like in a coffee shop, mall, airport...well you get the point. </div></div>

I'll wager that he has.

http://www.snipershide.com/forum/ubbthreads.php?ubb=showprofile&User=4396
 
#23
Re: Free Energy for your phone or PDA

I doubt they can even get it past the self discharge rate of the batteries. It's quite an old idea and it's simply not usable. The real issue is guys who think it can or does work. We had some in this thread.


I would buy some though, put them away in the packet and in a few years sell them to "collectors"
wink.gif
 
#24
Re: Free Energy for your phone or PDA

Lindy, I cannot afford it either so I brought my van. The Japanese have been buying up my chow though so I might be able to stay for a week or two.

I am meeting up with them again tonight. They mentioned bringing me over to their city in which case I could be into a lucrative deal.
 
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