yashsingh1/xdaforums huggingface dataset:
[Android Q&A, Help & Troubleshooting] BHARDIK:
Hey buddy can u write coolpad online service center support for us

js ask them can they give you Sp flash tool supported Jelly Bean Firmware links for you

if they agree and give u links then share with us ..... or tell us what he say ??

Thanks

Hardy
[Nexus 4 General] tommmtom:
Just thought I'd share a mod I've done to my nexus 4..

After smashing the back glass on my nexus 4 and getting tired of glass shards in

my pocket/hand every day I decided to make a new back for it (£50 for a replacement is a bit excessive..)

I thought I may as well try and add in another battery too, as I don't mind a thicker

phone and would always opt for a fatter phone with more battery if I had the choice..!

Now I have a 4200mAh nexus 4!!!

How To:

-Remove the battery cover, and remove all the glass from it (its a pain...so much glue...but easy with blade to slide under)

-Solder a wire to the positive of the battery connector (disconnect the battery) and a wire to the negative side. Leave them fairly long for now...then reattach the battery connector to the phone

-Peel off the NFC/wireless charging coils from the battery cover and put to one side

-Solder a wire to each of the 4 gold spring contacts that connect to the coils...leave these fairly long too

-Put the battery cover back on the phone making sure all 6 wires are sticking out the back

-Now put the second battery (I used a Samsung galaxy S3 battery, 2100mah 3.8v same as nexus 4 (and cheap)) in place on the back of the phone and fix it in place (double sided tape, hot glue..)

-Measure the voltage of the second battery and then measure the nexus 4 battery voltage and either charge or discharge the nexus 4 until the voltages of the two batteries are within about 0.05v of each other

-Solder the positive wire coming from the nexus 4 battery to the second battery positive contact, and negative to negative

-Put the coils on top of the second battery and fix in place. Then solder the 4 wires coming from the gold spring contacts to the correct contacts on the coils

-Now mark out a thick piece of plastic (I used 12mm Acetyl) so it fits in the step where the glass sat. Then use a router or similar to cut out a pocket for the second battery to fit. I shaped the back using a router, and finished it off with a belt sander.

-Fix the new back part to the phone using something sticky (I'm going to re stick mine with sikaflex, but hot glue or double sided tape work!)

-Now enjoy over 7 hours of screen on time!!

________________________________________________________________________________________________

Original post:

Hi there, I'm hoping to add a second battery or single larger battery to my nexus 4.

Can anyone see any problems adding another battery in parallel with the current one? The charging circuits are built into the battery so I guess it should work.....

Also I'm thinking of putting in a higher capacity single battery...from a note 2 maybe or one of these case batteries

I'm not bothered about the battery cover part of the phone..I can get that sorted after its working :)
[Nexus 4 General] scream4cheese:
I doubted you and I should be ashamed. Lol
[Nexus 4 General] tommmtom:
Yeah I have the back off (it was smashed so I'm making a new one!) And its easy to add in small wires to the connector to get a battery in parallel. I've ordered a 3.8v 2100mah battery which is here tomorrow and I'm going to try it :) as long as I have both battery voltages identical before connecting them in paralell, there shouldn't really be a problem as the voltages should stay identical & both have separate charging circuits!

Yeah I was reading the thread about the ZeroLemon cases yesterday, they should be good!
[Nexus 4 General] username8611:
I'm not sure but if you wire them in parallel, would that effectively double the voltage and fry your phone? Using a single larger battery with identical voltage to the original outta work though
[Nexus 4 General] snapper.fishes:
It's the other way around. If you wire them in parallel, you double the current. If you wire them in series, you double the voltage.
[Nexus 4 General] tommmtom:
Okay I'm running with a sgs3 battery (3.8v & 2100mah) in parallel, so now have a 4200mah nexus 4 :D I'm just finishing off wiring the wireless charging/NFC coils then I'll try and get some pics....
[Nexus 4 General] username8611:
pics would be awesome, im curious about this alternative back you are using since you said the stock back shattered. also pics of the inside showing how you mounted it all would be cool. i would never do this but it sounds really interesting so if its too much of a pain, no biggie
[Nexus 4 General] tommmtom:
What I'm doing with the back: I've taken all the glass off the plastic bit(the rubberised surround is part of this..) And where the glass was there is a step where it sat. I'm putting a thick back (Plastic) with the inside milled out for the sgs3 battery to fit. It will Be rounded and look a bit like the HTC one back :) then I'll wrap it in carbon fibre effect vinyl so it looks nice and professional!
[Nexus 4 General] tommmtom:
Battery life is epic......4 hours screen time with full screen brightness after 24 hours off charger!!!! Only problem is that the battery meter goes down as usual (same speed) but stops around 20% (~3.8v) and stays there for aaaaaages before starting to drop again....

There is a file in sys/class/power_supply giving the full capacity of the battery (2100mah). Is this used to calculate percent? I might try changing it to 4200 and see if I get better readings....
[Nexus 4 General] androidfoshizzle:
Pics??
[Nexus 4 General] tommmtom:
Look at the battery graph..... Stays flat for hours even when being used! Battery is very good... 2 days of proper usage!
[Nexus 4 General] Nbsss:
Awesome!

How long does it take to charge lol :D
[Nexus 4 General] tommmtom:
Twice as long as before! :P
[Nexus 4 General] scream4cheese:
You think you could make a video of the process? Lol.
[Nexus 4 General] tommmtom:
Battery just died... 7hr 15min screen time after nearly 35.5 hours off the charger :)))

Its actually really easy...only hard bit is getting a back cover to fit over the extra battery...3D printer would be nice

Cost me £5 for the battery & £3 for the plastic (acetal) block the back is made from!

I will get some pics of the back when its finished properly :)
[Nexus 4 General] Domenl:
Could you use any other phone battery? As I have some old smartphones laying around. Might try get into this mod as I never say no to more battery life.
[Nexus 4 General] tommmtom:
Yep i guess you could...each battery has its own protection circuit in so the batteries can't over charge etc

I will whack some pictures up of my neuxs tonight...its all done now :)
[Nexus 4 General] paul c:
Nice one! Another option is to buy a 5000mAh battery pack, a good one like NewTrent often costs $25 - price varies quite a lot for some reason. It's a black rectangle about as big as the phone, and you just connect from the USB port to the phone with a normal charging cable. And you charge it up from a PC/wall charger.

Obviously a bit messy when you actually have to connect, but when you are not charging the phone is still the original size.

Hope I didn't spoil the fun :)
[Nexus 4 General] Domenl:
That would break this in the root. We are trying to add a battery not charge the existing one. I own a 12000mAh battery but this is very interesting as it would improve the battery capacity directly.
[Nexus 4 General] CDeviant:
Are you still working on this?

I'm sure everyone would love to see what you've come up with.
[Nexus 4 General] shenery:
What about these for battery stats?

Everything up full blast. Using sat nav the lot. Full brightness 3g and WiFi on all the time.

I reckon android 4.3 has improved my battery.

Might try and see what I can get with 2g on.

Do you think I would notice a difference. What else could I do to keep it on for longer to see how long this baby can really go?
[Nexus 4 General] Techguy18:
I really dont think that this is safe.. It may work initially, but according to me, the charge controller will get messed up because it might have to use more current to charge both the cells.. also, unregulated high current might work okay at first but it will overload / overheat certain components and might do permanent damage.. I doubt it will be easy to calibrate the battery scale beacuse you need the S3 battery to also connect to the phone.. even if the pinouts are same, the n4 battery signal will intefere wilth the s3 battery.
[Nexus 4 General] ziddey:
"according to me" :silly:

The phone limits the current. If you plug in a 2.1A charger, it won't charge at 2.1A. The kernel driver msm_otg.c "limits" charge rate to 1.5A for "AC" charging, but I've never seen anything close to that.

Thus, it'll take twice as long to charge. If heat does reach a "critical" point, it will stop charging until it cools, but I simply can't see that happening. I have tripped it multiple times in the car when I'm charging my phone on the dash in the hot sun..
[Nexus 4 General] shenery:
I have smart battery monitor running constantly and the temperature is 32 degrees or there about all the time. Never ever gets too hot :D
[Nexus 4 General] Nacro:
Can you say how thick is it approximately in mm?
[Nexus 4 General] shenery:
About 12-13mm since adding the battery. I think the phone has a nicer weight in the hands now
[Nexus 4 General] fcb-1899:
That's actually pretty good, what ROM or kernel are you using?
[Nexus 4 General] shenery:
Using paranoid android the newest one.
[Nexus 4 General] goatgoatgoat:
Hi guys,

I have been lurking on xda for a while but this thread was the one that forced me to register and contribute as it's something I have been considering myself lately.

My idea was to build a new battery by ripping apart two OEM nexus batteries and making a new two cell battery similar to the extended batteries you see (often if the cells are matched you can even use a single charge board). So ultimately I will end up with a double thickness battery.

To accomodate it within the phone I was considering two options. The obvious would be to 3d print a new back that is slightly deeper and to transplant the qi and NFC hardware onto the new back

My idea is to instead 3D print a 'shim' that sits between the phone and the OEM plastic+glass laminated back. As to how to secure it, I have not yet had a good look.

Does anyone believe this would be a valid (and prettier) solution?

In fact, if you were going to make a 'kit' as someone suggested where you supply a shim, if you made it H shaped (rather than just going around the edges) so that the shim supports a rail that runs past the stock pickup for the NFC/qi and used some conductive feet to elevate the contacts so the consumer needs no soldering. You could simply have four small plastic nubs coming off the support rail coated with adhesive copper foil.

Obviously this is just a digression and in my case I will just solder the damn thing or leave disconnected as I use neither technology.

I imagine the easiest way forward would be for me to get out a micrometer and basically emulate the existing back design except make it slightly deeper. I guess losing the glass back isn't really a con.

Any ideas guys?
[Nexus 4 General] noowb00:
Yep. I plan to do the same thing but my laptop is f*cked right now. I've drawn a stupid sketch of it with 3 different perspective, though. Wanna see it?

I didn't go as far for making a kit though. Kinda like traditional soldering coz hacking the contacts doesn't seem that reliable unless you have the proper equipments.

So, you're planning to make the 3D model?

Sent by my 'Mako Mori'
[Nexus 4 General] goatgoatgoat:
Sure! Can you PM or post the image(s)?

Yeah, I am not seriously considering a kit. Was more or less thinking aloud.

That's the plan. I don't have access to a high quality (not going to settle for a cheap makerbot) 3D printer but will just get the file printed by one of the commercial prototyping companies. It isn't especially expensive - especially if you think of the alternatives, which would be either lugging around a portable charger or using a massive charging case like the Zerolemon or Mugen.

I figured the sensible approach is to use two OEM N4 batteries as a) it fits the existing depression and b) capacities are synchronized so we don't run into any issues down the line (this is especially important if you are sharing a charging board as misusing a Liion or Lipoly is baaad mojo esp when it can blow your pocket up) and to build my own two cell pack.

I don't think it is worth fooling around with a second pack of larger dimensions as well, aside from what I have said above it just isn't worth the increase in complexity for a minimal gain in capacity. I suppose if you had separate charging circuits you could, say squeeze a bigger cell in but why bother?

I think a decent 3D printed extended case would look the part as well as be functional.
[Nexus 4 General] noowb00:
Here;

It's not all that perfect as I don't have the proper software (I just use opencanvas 1) to sketch it :P Hope the one you have is wayy better, this one is just something that flashed through my mind.

I really like the idea coz it would really help everyone else. I'm pretty busy right now (exam week) so I can't offer much opinions right now.

I'd really like to see how yours would turn out :) Good luck!
[Nexus 4 General] goatgoatgoat:
Thanks. I obviously need to get busy in the next few weeks with a micrometer and take some accurate measurements of the nexus 4 stock back. I think at this point I will save a file as this may help people who have smashed their glass back and just want a cheap replacement.

If I was lazy I could use an elastomer like material as precision wouldn't be as much of an issue with something flexible. But this isn't what I want.

Interestingly enough once we have a STL file for either size back people could theoretically use a service like Shapeways (can't post a link, just Google and go to their materials menu to see what they offer) to even get it done in stainless steel if they wanted something expensive and durable.

Obviously I will be doing mine in simple black ABS with possible grippy finish ala early moto handsets prior to their adoption of Kevlar.

Anyway, in theory once we have a viable STL of the stock case then it will be trivial for anyone to open the file in Google Sketchup or similar software and add whatever additional depth they desire.

As I don't have my own 3D printer and will have to pay for the printing of my designs I need to make sure I get the measurements correct. It is probably wise for me to make the tangs a few mm longer than they need to be as it is easier to remove material than add! If anyone here has a cheap 3D printer and a N4 - their help would be appreciated as they can print and test fit the designs before I put down the dollars to get it done at a print house.

A decent back is the only thing that makes this mod unachievable for the average tinkerer. Cheap 3D printed backs will fix this.

Additionally it wouldn't be difficult to make a custom extended battery with the stock connector on it so the average Joe doesn't need to do the bulk of the handiwork. If we provided a back and a battery then all the user would need to do is peel the NFC/qi from their old pack and transplant if they required it. I am guessing many won't even bother as these two features are not exactly well adopted.

---------- Post added at 06:42 PM ---------- Previous post was at 06:16 PM ----------

update: I don't have my n4 and tools handy at the moment so can't open to confirm but I had a quick look on Google images for "nexus 4 disassembly" and it appears that the power and volume buttons are on the back piece. If this is true, this significantly increases the complexity of what we are trying to do. I hope that the buttons are held in by the main piece of the phone and the back piece merely has openings to allow them to be accessed. I guess an alternate way of doing this would be to keep the stock back and make a custom hard case to cover the ugliness but if I am going to do this then it had better be done right.
[Nexus 4 General] shenery:
The volume and power buttons are part of the nexus 4's back cover

---------- Post added at 04:25 PM ---------- Previous post was at 04:17 PM ----------

Should probably be able to pop the out though
[Nexus 4 General] goatgoatgoat:
Damn. I was hoping that they would be part of the chassis like on most cells and the replacement cover would need only the openings. It is entirely possible to 3D print a recess that would accommodate the stock buttons but we are sort of reaching the limits of what I can accurately duplicate with hand measuring the dimensions and angles. If I had even a basic 3D printer of my own and could make multiple prints and get the design right by trial and error I would be more inclined to say it's easily done, but it could get expensive fast when going backwards and forwards to a prototyping printing house. That said, I intend on getting a cheap 3D printer at some point.

I guess we could accomplish this with a printed solid case that snaps onto the N4. A hole can be drilled in the plastic of a broken (glass layer removed) back to feed the wires through and the NFC/qi module moved onto the case so that these features still work. The N4 batt stays inside the phone and the second N4 batt sits in a recess in the new cover back.

Another way we could accomplish this would be to make a shell that doesn't wrap around and is simply plastic welded to the back of the N4

None of these solutions are as elegant as printing a completely functional back.

I suppose people would ask 'why' when you can make a snap on plastic back with an external battery and 5v regulator and power via micro USB - the obvious reason is it is wasteful charging a battery from another battery.

---------- Post added at 12:38 PM ---------- Previous post was at 12:26 PM ----------

That said, I wonder about the current charging cases and why they neglected a few important features. I know the stock kernel doesn't have OTG support but given the amount of bulk it adds and the fact it sits inline with the USB, (and the intended market of these packs to power users) it would have been trivial for them to include a small three position switch - pos 1. USB d+/d- crossed, pack will fast charge internal battery. sync unavailable obviously. 2. USB data connected to port on phone, 5v injected by the pack into power lines so external OTG accessories can be used. 3. all lines pass through, pack charging off. Given the size of a USB microSD controller board and socket they could have also integrated one so it can be used when in OTG mode.
[Nexus 4 General] shenery:
Pm'd

---------- Post added at 11:20 AM ---------- Previous post was at 10:58 AM ----------

3D Models of Nexus 4

Hope they can help.

http://3docean.net/item/google-nexus-4/4487363

http://grabcad.com/library/nexus-4

http://sketchup.google.com/3dwarehouse/search?tags=nexus+4
[Nexus 4 General] goatgoatgoat:
I have PM'd a response. I think the easiest way, at least temporarily to tidy up your phone is to print a nice hard snap-on case with extra clearance at the rear to accomodate your Note 2 battery. Let me know via return PM what you think of the idea.
[Nexus 4 General] furyoflight1029:
This seems fun. Although I have no intention doing this mod on my beloved n4, but ill gladly help by making a 3D model.
[Nexus 4 General] ziddey:
I ended up just getting the zerolemon case. It's excessively large, poorly made, absolutely hideous, and whatever other negative comments... but, the good news is that there's tons of space next to the camera/led. Rigged up a Kingston microsd-usb adapter to it. Hello storage. Goodbye nfc/qi :(

That said, my idea for a battery/sd case required maintaining the ability to use nfc/qi, as well as ease of "installation." I'd love to have a custom back made, but there's just too much going on for it to be feasible (for me at least). Instead, it'd make more sense to have the battery/sd part slide out. And to make this "logical" I figured why not add a physical keyboard.

Slide it out and you have a physical keyboard, plus the ability to use nfc and qi. Plus, it'd have a built-in microsd slot. Maybe you could have the keyboard be usb and build in a usb hub and additional microusb port. Of course, this got way too elaborate way too quickly, and I could care less about a physical keyboard nowadays.
[Nexus 4 General] goatgoatgoat:
That would be pretty cool! I have modded up a snap in case for shenery to print and try out so if it works as expected will put the file up along with any modifications made along the way. The only two things that might need changing are camera (will probably make the opening a bit larger and have it slope down in a gradient so as to look a bit sexier given how far away the lens will be due to extra case girth) and 3.5mm (current design has a largeish square opening to be conservative but will eventually make it a much smaller circular hole that lines up).
[Nexus 4 General] goatgoatgoat:
I get what you're saying, many people don't want to go poking around inside their shiny smartphone. For that crowd a /decent/ case is a great idea. Unfortunately there isn't anything decent out there at the moment.

The lack of qi could be easily solved by having the case equipped with one. It would then inject any power into the USB to charge the phone (and you could probably use an IC like the ones Maxim make to only direct qi derived power to the case battery when the mA draw from the phone is under a certain target). NFC would be very difficult to work around, at least passively and likely not worth the effort. Lovers of Touchstone could substitute a touchstone module from a Palm Pre and use their old charging stations.

That said, a flip down or out battery module could work - need to use NFC? flip the batt out of the way.

You could also use an engineered battery pack perhaps made of lipo's to make use of all available surface area but leave the area immediately around the NFC an airgap. Might be enough to work if it isn't being attenuated by the cells being over it.

That said, I am likely to go down the route of buying a broken N4 on eBay to use its back, 3D printing a back extension and then cold welding it to the back. If done carefully (might need to use some resin around the joint and sand to a smooth finish) it should look almost stock. I plan to have a few small metal discs in the extended back (obviously placed where it won't attenuate signal) so I can build a magnetic car dock to hold the damn thing.
[Nexus 4 General] shenery:
Managed to get it printed up for me for £15. So should be here in the next few days :D
[Nexus 4 General] goatgoatgoat:
Cool! Let me know when you get it and importantly enough if it fits correctly! We will call this v1.0. I will ultimately fix the camera so it slopes slowly down and there is no air gap between where the case camera hole is and where the back is to avoid any strange behavior when the flash goes off (as it can reflect off the case)
[Nexus 4 General] xFloTK13:
Thats awesome! :D i'll do this when my phone breaks

Gesendet von meinem Nexus 4 mit Tapatalk 4
[Nexus 4 General] Sharqi:
obviously you get larger time with connecting batteries in parallel, but they will require higher current to charge too and i am sure they have not made the circuit taking in mind such high currents. such high current might heat certain components on the board and eventually frying the board(may be over the time).
[Nexus 4 General] goatgoatgoat:
There won't be a higher peak charge current, just a longer charge duration. The power management and charger silicon in modern phones are quite intelligent (eg the Qualcomm PM8921 in the N4) and will monitor temperature and suspend charging if needed until the device cools down (and conversely it won't charge a cell when the cell temp is too low, eg freezing).

The only caveat I can add is that it will only be getting temperature info from the thermocouple in the main battery. Given how close we are mounting the second cell it probably isn't a huge issue but this does potentially have safety implications.