yashsingh1/xdaforums huggingface dataset:
[Nexus 4 Accessories] phermey:
i got my lg for 55 with tax. whatever the difference may be, who cares. i plugged it in. sat it on my end table next to me and put my phone on top of it. you will never believe this... but it just works. no foil. no lids. no pans. no taking two minutes to find the sweet spot.

there is something to be said for 'ease of use'. time is worth money. lack of stress is worth money. knowing that your phone will charge every time you need it to without a hitch is worth its weight in gold.

there are times to be frugal just as there are times when being frugal is counter productive.
[Nexus 4 Accessories] Cyberdan3:
I tried charging mine with a piece of aluminum foil underneath for about an hour. My battery was at 64% and after the hour of charging, my phone was very hot and was still at........64%

I don't understand how it would work for others but it tells me it is charging while all it does is convert the induction charging to a lot of heat for the charge and phone. What am I doing wrong?

I have two Zens chargers on order so hopefully those will work flawlessly. I'm sure they won't feel as cheap and flimsy as this either.
[Nexus 4 Accessories] phermey:
seems to me like the magnet is too close to the top of the charger. and is barely making contact with the magnet in the phone. thus all of the energy is wasted. that charger was designed for a case to be put on a phone. whereas they can stick the sweet spot wherever they want.

someone needs to pop off that plastic hump with the on off switch and see if that will allow for the phone to slide up another half an inch or so.
[Nexus 4 Accessories] twolfekc:
My phone works wonderful with it!! Just fold up some aluminum foil and set it underneath!!! If anybody needs a picture or something I'd be happy to take some later
[Nexus 4 Accessories] jimmyz:
If you just put the charger itself on a piece of aluminum foil it goes into charging mode (with or without phone there!)- it will get hot really quickly that way which explains why they warn not to place on metal. I think the trick is to have enough separation (as mentioned above one part of a plastic cd case for example) from the metal so that ONLY when you place the phone on it it starts charging- Right now I found that an empty checkbook holder does the trick. Be careful when picking the right separator as you don't want anything that simply the weight of the phone compresses it and starts the charging - a quick test is that it should only activate when phone usb port is pointing toward the top.

My sense (theory) is that without additional metal the phone cannot activate the charging mechanism and with too much metal the charger starts "charging" without a load.
[Nexus 4 Accessories] Caner092:
I am outside of the US, is there anyone can send me two of it for price?

Is there any QI symbol on it or box?
[Nexus 4 Accessories] Cyberdan3:
No Qi identification on the box.
[Nexus 4 Accessories] twolfekc:
How much? i got one id send
[Nexus 4 Accessories] Caner092:
I sent PM to you :)
[Nexus 4 Accessories] frigidazzi:
Can someone show a picture of what it looks like with the plastic and aluminum foil properly placed on it? Is the aluminum foil and plastic visible once placed? Does it hang out of the edges?
[Nexus 4 Accessories] intekmdma:
I couldn't find one at Walgreens
[Nexus 4 Accessories] frigidazzi:
I just went to mine too and they didn't have any. The web site said in stock, but the girl looked it up and their computer said discontinued and no more available :(
[Nexus 4 Accessories] logic0verflow:
Same situation here, will try others tomorrow :fingers-crossed:
[Nexus 4 Accessories] _guzzler_:
Went to local walgreens where it showed available in store. Didn't find one. Asked a helpful store keeper she looked in the computer and said discontinued. I told it says available in store on walgreens website. Then she got one from the back of the store but it was for 34.99. Asked the manager to give it for 7.50 he said max he can do is 20.

Didn't buy.
[Nexus 4 Accessories] intekmdma:
I'll try another store. Maybe i'll have some better luck.
[Nexus 4 Accessories] florelui001p:
I bought mine off Amazon for 15 dollars, works with the aluminum trick but I decided I'm better off with my two energizer qi chargers. If anyone would like to purchase it off me pm me.
[Nexus 4 Accessories] g2reno:
In San Antonio, there were 3 walgreens that had them. I bought 2 from the one on Oblate/San Pedro...there is one left next to the photo section...just search good.

Mine were marked down to $7.49 each so I got two....now I'm trying to find a safe way to charge it without the burning plastic/overheating smell...
[Nexus 4 Accessories] mrbkkt1:
+1 here. Although I love the fact that we will mod almost anything here on xda, the fact that the lg charger works flawlessly is the main benefit. I love my lg charger.

I just hope that nobody starts a fire with this Walgreen's charger
[Nexus 4 Accessories] -=BaDZeD=-:
Try separating the charger from aluminum blacing something non-conductive in between (plastic, corrugated cardboaed, etc..)
[Nexus 4 Accessories] twolfekc:
Here's how you do it. Get something that is conductive. Such as aluminum foil, a kool-aid pouch, or something else that you could cut and fold up. Hopefully you didn't throw that iPhone 4 case that came with it away, next fold up the conductive material you got 3-5 times so that it will fit inside of the iPhone case. Then put the styrophom that was originally in the case back into the case to hold in what you just put in. Then put that under the charging mat and your golden!! Sorry if that didn't make sense but that's the easiest thing I have found that worked
[Nexus 4 Accessories] shroud27:
From what I recall from class, the need for a conductive surface underneath the charger could be because the inductive coil inside the carger is not generating an electromagnetic field big enough to be picked up by the phone. By placing aluminum underneath the charger it focuses the electromagnetic field and forces it in the direction of the phone. The manufacturer naturally recommends against this because if the electromagnetic field is too big (larger than the design spec) it could overheat and kill the battery in your phone.
[Nexus 4 Accessories] CobieS:
This Is how I got it to work. Pot. Piece of thin cardboard.
[Nexus 4 Accessories] pinoyz:
For anyone using this, how hot does your battery/back of the phone get when you place it on the charger?
[Nexus 4 Accessories] Da_Sheezy:
LOL... same exact thing happened... FAILgreens website said 2 stores had it, drove to first one only to find out they were discontinued... called other store... none... found on amazon for $15 shipped and apparently used... bought 2 for $30... they just arrived, brand new, with alum. foil fix works any way you put it on there... gonna keep one intact for now, then dissect the other one for either my car or custom in desk mod... super cool...

appears to heat up phone pretty fast though... and not charging all too quick...

oh well, at least im only invested up to $30... and I can always resell

oh, and don't forget a nice clean strip of black electrical tape to cover the Uniden logo and blinding led!
[Nexus 4 Accessories] jimmyz:
Make sure you place some separation between the charger and foil (so it only activates when u place phone on it) or else you will burn the charger up
[Nexus 4 Accessories] ssskom:
anybody needs this charger hit me with a PM. I finally scored an energizer charger and will no longer need this item. Gonna let it go at cost but have to wait till the item arrives...I mean the UNIDEN charger as its still in shipment
[Nexus 4 Accessories] lfpayne:
Got one of these but am worried about how hot the phone is getting, apparently tho this is normal for inductive charging from what I have read. Can anyone verify this ?
[Nexus 4 Accessories] mrbkkt1:
My phone does not get that hot using the lg charger. Not any warmer than the plug in one.
[Nexus 4 Accessories] Cyberdan3:
I wanted to like this charger but today I bought one of the LG WCP700 chargers and it is just slick. The build and feel are so impressive. This Uniden charger honestly feels so fragile and I no longer feel it is with the hassle just to make it work. I understand price comes into play, but the LG is worth every penny. I well be returning my two Unidens unless someone here wants to buy them.
[Nexus 4 Accessories] -=BaDZeD=-:
My Uniden does not make the phone hot. It did in the beginning, however, before I figured out the proper separation between the charger and the metal sheet.
[Nexus 4 Accessories] lad2:
delete, reread the previous posts
[Nexus 4 Accessories] ssskom:
DELETED. See below for mod works :
[Nexus 4 Accessories] ssskom:
Attached is my mod and so far its working great! My phone doesnt get warm while charging wirelessly (well honestly, just a tad bit warm, just like regular charging) Below are the steps if anyone wants to follow :

1) Tape the surface between the 4 rubber legs underneath the charge pad. Just 1 layer of tape is enough

2) Cut and tape a very small sheet of aluminum foil on a Spigen Squeegee (not sure if other squeegee is thick enough). See attached pic for size ref...and no you dont have to use any kind of pots :D.

3) Tape the squeegee and the aluminum sheet between the 4 rubber legs below the charge mat. The aluminum sheet should be facing down, where the squeegee acts as a spacer between the charger and the Aluminum sheet.

4) Start charging!...wirelessly

With this mod, the charger will only turns on when the phone is on the mat. Without the spacer, it will continuously stay on, even when the phone is not on the mat (just like the other posters had mentioned). Note that green light in the pic means it is on "standby" mode. The light turns red after the phone is placed on the mat, i.e "charging" mode and will turn back to green once it fully charges the phone. Oh, and I charge it with the case on (TPU S-Clear case)

Done! a $15 wireless Qi charger! Well, $10 to be exact. $5 was for shipping! :D
[Nexus 4 Accessories] wtang:
Only charges to 92%?

Remember me? I'm the guy who first came up with the idea of using aluminum foil. :) *takes a bow* Anyway, I've been using this Uniden charger for about a week or so and I'm generally pretty happy with my $5 wireless charger. The only problem is it only seems to charge my phone to 92-95% before stopping. It doesn't seem to charge to 100%. Has anyone else noticed this?
[Nexus 4 Accessories] ssskom:
Ill check to see if it stops at 90+%...will update in this thread.:good:
[Nexus 4 Accessories] logic0verflow:
Mine usually stops at 96% with wall charger but a restart gets it to 100%, perhaps try restarting it?
[Nexus 4 Accessories] ssskom:
did u turn on wifi while charging? I turn off daydream and wifi...so far it has reached 80% from 65% :D
[Nexus 4 Accessories] ssskom:
now at 93%...
[Nexus 4 Accessories] wtang:
Did you ever make it to 100%? My phone charges to 100% with the wall charger, but it only makes it to 95% with the Uniden wireless charger. I do turn off Wifi before charging, but I don't know what you mean by "daydream".
[Nexus 4 Accessories] lad2:
How thick is the squeegee?
[Nexus 4 Accessories] mrbkkt1:
Settings> display > daydream.

Kind of like a screen saver.
[Nexus 4 Accessories] ssskom:
About 1 to 1.5 mm thick. I also tried using a layer of leather and it worked too... but I prefer squeegee.

Just a word of caution : Dont use paper/cardboards or anything thats easily burned/flammable, which can be a fire hazard. Just to be safe.
[Nexus 4 Accessories] ssskom:
I just got a full charge today (100%). It was at 97% last i checked. Left it for a few more minutes and it was fully charged. But the issue is the charger does not change its status from "charging" (red) to "stand by" (green).

Will try again once my phone gets to 80%

---------- Post added at 02:03 AM ---------- Previous post was at 01:32 AM ----------

yep. I can confirm that I got a full charge again the 2nd time :victory:

But the issue is the "charging" mode does not change to "stand-by" mode after a full charge :confused:
[Nexus 4 Accessories] dmeehl:
Same thing here. Anyone get the charger to go to stand-by after charging is finished?
[Nexus 4 Accessories] terracode:
I disassembled the Uniden UN904 and found that, as we already have found, is very cheaply made. The coil doesn't have a ferrite shield under the coil as required for Qi compliance, reduce EMI and increase the efficiancy of energy transfer. This is why many are seeing the charging working with the N4 when an aluminum or metal plate is put under the base. One has to be careful with this since the design may end up inadvertently heating up the phone's metal parts. The coil is also is very cheap. There is a very thin plastic that sits on top of the coil, but this needs to be 2mm for proper compliance.

I removed the UN904 coil and put on a Qi complant coil. The UN904 board didn't start charging. More head scratching is needed.
[Nexus 4 Accessories] dmeehl:
Excellent. I was going to give this a try after the Holiday break. Which coil did you end up getting, and what was the cost? I also assumed it would work with a proper coil. You may want to measure the resistance of the two coils to see if they're different. I was also thinking about buying a ferrite plate and throwing that behind the existing coil to see if that helped.
[Nexus 4 Accessories] terracode:
The Qi compliant coil I purchased is the Wurth Electronics 732-4056-ND transmit coil. Mouser has a nice list of Qi components if you search on Qi. I initially wanted the Vishay coil since it is more elongated, but was out of stock. I bought the coil from Digi-Key. I am having a hard time sourcing a ferrite plate for modifying the Uniden unit. It would nice to get a thinner ferrite plate than what Wurth uses, but this is what is recommended by the spec.

The cost of the coil (1 piece) is $12.00 for the Wurth coil. Costs for the coils vary widely, but appears that the transmit coils are almost 2x he price of the receive coils.

One thing that is strange in the UN904 is that the leads of the transmit coil touch as the they cross into the board to attach to the power connection. I am not sure how much or if this increases the energy loss to the receiving coil.
[Nexus 4 Accessories] dmeehl:
Wiring used to make coils is coated in a film that insulates and prevents conduction. That's how you can have a wound coil and not have the power just jump straight across and out the other side. The ends where it's soldered onto the board are stripped of the coating before soldering. So, it should not increase energy loss at all if the coating is still intact.
[Nexus 4 Accessories] r1nstang:
I just found these at my local walgreens. they had 2 in stock. so i grabbed em both. works great. I got a piece of 1/8" plexiglass and some aluminum foil. charges immediately once i put the nexus 4 down. as long as the bottom of the phone is within 1/4" of the "hump" of the pad it immediately starts charging.

if anyone needs one of these let me know. cost was $20 plus you gotta cover shipping.
[Nexus 4 Accessories] peachpuff:
Just got the 5wc800 charger, if you open up the casing and pull the coil down a bit you won't have to turn the phone 180 degrees to charge it, now it charges in any position.
[Nexus 4 Accessories] lfpayne:
Is the 5wc800 essentially the same as the Uniden ? Bought Uniden but took back because was worried it was overheating phone, tempted to try out 5wc800 but heard that uniden is just a rebranded 5wc800
[Nexus 4 Accessories] ssskom:
Now that I have both the Uniden and Energizer dual Qi charging pad...I can't tell if the Uniden is overheating the phone or not..

Because everybody seems pretty happy with the energizer charger and claimed that it works 100% of the time.

Thing is, my energizer also causes the phone to warm up a bit...just like the Uniden.

PS : I'm keeping my Energizer pad and if anyone wants the Uniden, lemme know via PM ($15 + ship). Im located in the US so shipping should be fairly cheap within the US. I can re-box it in a smaller packaging & exclude the iphone casings to save on shipping.
[Nexus 4 Accessories] joey3002:
wife bought me 2 energizer pads for xmas. I have 2 unidens if anyone wants. I can do 15 + shipping for each or 25 plus shipping for both. I am in US, northeast.

If you want, I can toss original box and the iphone stuff to save on shipping or I can just use a smaller box.

PM me if interested. I will update this post if they are gone.

thanks
[Nexus 4 Accessories] dmeehl:
Did you play with the new Qi coil any more?
[Nexus 4 Accessories] terracode:
Had company in town during the holidays so didn't get any time to play. Company left yesterday and I have the rest of the week off . Next week I am at the CES. I am hoping to play with it some more before next week.
[Nexus 4 Accessories] jutezak:
Smart or dumb charger?

What about the electronics in that pad? Are those the same kind of parts as used in Qi chargers? The background of this question is: A Qi charger must get the physics right (field strength and frequency, coil size and location etc). But it also follows a protocol: it 'pings' the device to be charged and communictates with it before it starts charging. This is also used to adjust power and switch off when charged. Encrypted by the way, so you probably need to take a license to build this. Bleh.

Now if someone were to build a 'dumb' charger that just transmits full power when on, the phone my start recitying this as long as the frequency is correct. But power may need to be reduced internally, leading to heat.

And finally the charger will switch off the LED when the consumed power drops under a certain limit, which means the final few % of charge doesn't get in.

The following the insides of the Philips Qi charger (iPhone 4 sleeve pack), which does not have a dedicated Qi chip, so you can see it takes quite some parts. This one has 7 coils so it also charges the phone if it is not in the middle, and a temperature sensor to detect overheating:

https://lh3.googleusercontent.com/-...AAAACo/Y80l5s1_n3Y/w785-h589-p-k/04-01-13+-+1

https://lh5.googleusercontent.com/-...AAAACo/K8nh_KbhhEA/w353-h264-n-k/04-01-13+-+3

https://lh3.googleusercontent.com/-...AAAACo/iS-SjkN8m18/w354-h264-n-k/04-01-13+-+2
[Nexus 4 Accessories] terracode:
I had success on the Uniden UN904 mod (to a degree). I posted to a new thread:

http://xdaforums.com/showthread.php?t=2082947

---------- Post added at 05:12 PM ---------- Previous post was at 05:02 PM ----------

The Qi charger senses a draw and sends a message to the receiver for a handshake. The Qi receiver then sends a signal back as to its state. If no reply, the Qi charger shuts itself off and then possibly polls again in 20 seconds or so (if the device is still on the plate).

The Uniden is a 'dumb charger' that monitors the load on the coil and stops charging when a certain load thresh-hold is detected (from what I can gather). It has a switch that you press prior to putting the unit on the platform, so it doesn't negotiate with the receiver. It appears that the smarts are in the transmitter and the receiver will receive a charge, but will not be able to communicate charge state back. I gather this is why the Uniden works with the Nexus 4.

The Qi whitepapers outlines the signal and handshake requirements for the transmitter and receiver. It is a pretty thorough document and good read. You can get it on the Qi consortium site.
[Nexus 4 Accessories] shakib034:
does 5wc800 work with a case?

does 5wc800 work with a case?
[HTC One X] Tomaka:
Hi folks,

I took sometime to check that my phone was working properly for warranty reasons and now I am desperately trying to backup some of my apps (not even everything...) before unlocking the bootloader (which wipes everything, that's the whole problem!) and install a custom ROM. If have tried the following options :

Titanium backup : I am not root so it doesn't work. Other software could save my APK but not the actual data, which is what I am interested in

NANDROID backup : as I am not unlocked so I don't have a custom recovery image so no nandroid backup

adb backup : was my best hope but it really behaves weirdly on this device : it states in logcat that it can't find the specified package or that it can't bind it... really weird :

D/BackupManagerService( 272): Binding to full backup agent : com.mypackage
W/BackupManagerService( 272): Unable to bind to full agent for com.mypackage
W/ActivityManager( 272): Unbinding backup agent with no active backup
W/ActivityManager( 272): Process/uid not found attempting kill of com.mypackage / 10272
W/ActivityManager( 272): Unbinding backup agent with no active backup
W/ActivityManager( 272): Process/uid not found attempting kill of com.mypackage / 10272

I also tried this script (http://smartmobilehub.com/actionbar/36152/Ultimate-Backup-Tool-No-Root-Required) that automates the process, but as it uses adb backup it doesn't work either.

I am thinking about trying to root the device without unlocking the bootloader (with this tool for instance : Root MANY ANDROID! http://xdaforums.com/showthread.php?t=1886460) but I am really not confident it will work and will not hurt my device. Did anyone try that ?

Did anyone ran into the same kind of problem ? Has someone got a solution ?

Can someone with stock JB test if adb backup works (very easy command to backup google maps for instance :

adb backup -f mybackup.ab - apk com.google.android.apps.maps

If the output file is more than 1ko then it probably worked, you can check in titanium backup with the option : "restore from .adb backup") if JB solves this problem, then it's worth waiting for the update, otherwise I could try something else right now.

Thanks in advance for your help!
[HTC One X] BenPope:
adb backup should work. I've done it before, but never tried to restore it. None if the other options are viable.
[HTC One X] Tomaka:
Thanks for your input BenPope! I think you should check your backup with Titanium Backup, you could be surprised...:eek:

For me it seemed to work : first I launched the

full

backup, it did backup the shared part (SD card part) for a long long time and did output a massive several GB file, but it didn't backup all the other packages except for a random few ones (and I ran the backup several times caused it sometimes crashed my phone and overall the output size was always different). I discovered that with Titanium Backup, and therefore tried to backup a single package with logcat which outlined the problem exposed in my previous post.

Can you try backing up a single package if you are still on stock ?
[HTC One X] BenPope:
Maybe I'll try tomorrow. I'm not rooted, how far can I get with Titanium to test it?
[HTC One X] Tomaka:
You have no other choice than using another device that is rooted as Titanium Backup (TB) won't offer much options on a non rooted one... I used my tab for instance. Also keep in mind that this is a Pro feature that requires you to purchase TB (but if you plan on rooting, this is the best app ever! ;) )

Other option, without TB, you can try running the backup on a single package (use my command or ultimate backup script, see 1st post). If the output is a 1ko file with the -apk option (which determines to backup the apk too), then something went wrong...
[HTC One X] johnnyk75:
Just do nandroid back up in recovery
[HTC One X] Tomaka:
How? I don't have a custom recovery as I am not unlocked :(
[HTC One X] Tomaka:
Good news! I just had the JB OTA update today and it solves the adb backup problem : backup is now possible (though with no password and data only it seems, but it works). So I now have back-up my data and unlocked my bootloader, at last! :)

Thanks for your help folks