yashsingh1/xdaforums huggingface dataset:
[Nook HD, HD+ Q&A, Help & Troubleshooting] modelworks:
As an engineer I pulled some info from the datasheet for the chip the nook uses, it may help better understand charging issues.

full datasheet is on the TI site at:http://www.ti.com/lit/ds/symlink/bq24196.pdf

If you connect the nook to a low power pc port you will only be able to run the charging for 45 minutes before the charger IC stops. To start it again you have to unplug and re-plug the USB cable. The charge current for a 500ma usb port is about 440ma.

The device fast charges at 1.5A using the charger and charges at 4.208V to the battery. The bad battery setting is for 1.8V, so if your device battery falls to that level it will not charge because the chip assumes a failed battery. I see this a lot in tablets. Someone stops using the tablet when the charge is 10% or less and then 2 weeks later picks up the tablet and it appears dead. The battery cells have discharged below the limit and now will not charge. The device will consume power even if you power off the device because the charging controller is on 24/7 regardless of any mode except shipping mode which we do not have access to . Fix for dead battery is remove the battery from the tablet, charge on external charger , replace.

if you want the info on your own charge stats just type dmesg in a shell prompt.

data to look for is like this:

<7>[224884.880706] bq2419x_is_vbat_in_range: vbat = 4135000
<7>[224884.881378] bq24196 1-006b: bqSetSYSMIN: 3200
<7>[224884.882019] bq24196 1-006b: adj_fast_ichg_lim: 2036, 240, 2036
<6>[224904.594329] android_usb gadget: high speed config #1: android
<7>[224904.594818] bq24196 1-006b: USB_EVENT_ENUMERATED
<6>[224904.595306] android_work: sent uevent USB_STATE=CONFIGURED
<7>[224904.600708] bq24196 1-006b: INTERRUPT 08=6c, 09=0
<7>[224904.600952] bq24196 1-006b: S: Power Good
<7>[224904.601165] bq24196 1-006b: S: CHARGE STATE = 2 (FAST CHARGING)
<7>[224904.601531] bq24196 1-006b: S: VBUS STATE = 1 (USB host)
<7>[224904.601745] bq24196 1-006b: S: Dynamic Power Management enabled
[Nook HD, HD+ Q&A, Help & Troubleshooting] Sherip:
I have had a few close calls with my battery. It does not charge if verygreen's or other app that permits the Nook to host other USB devices is active, and in most cases I had accidentally activated it. Since it then refuses to charge when connected to power, its in greater danger of completely depleting. Easily fixed as long as the unit is still operating, but no obvious clue when that's the problem.
[Nook HD, HD+ Q&A, Help & Troubleshooting] Deleted member 2092952:
Also, when you put the power plug in real slow at the nook port, even when the battery is not 100%, it will turn green as if full charged and will no longer show that its charging. Possibly, could be initiated in another way I would think.
[Nook HD, HD+ Q&A, Help & Troubleshooting] Tzul:
Interesting about the "low power" port. But I haven't seen one yet. Nowadays, many USB2 ports provide up to 1000 mA without negotiation. Originally, the USB specification required that devices connect in a low-power mode (100 mA maximum) and communicate their current requirements to the host, which then permits the device to switch into high-power mode. But the USB Battery Charging Specification changed that. In recent years I've tested several PC mainboards, and an Xbox 360, all of them provide around 1000 mA on USB2 ports without negotiation.

But the Nook HD+ won't make use of that and limit itself to the 440 mA you mentioned. Why? Because it uses the two data lines (D+ and D-) of the USB connection to detect dedicated USB chargers. If the data lines are shorted, the Nook assumes it's connected to a dedicated USB charger and it will draw up to 2000 mA (about 1880 mA in my measurements). If the data lines aren't shorted, it'll limit to 440 mA no matter if the USB power source could provide more.

From where do you get the 1.5 A? Your own dmesg output says "adj_fast_ichg_lim: 2036, 240, 2036", and as I said, mine charges with around 1.8 A.

Also, the line in the dmesg output that gives away the charging speed isn't "CHARGE STATE". It always reads "= 2 (FAST CHARGING)" when an external power source is connected.

The line "DCP detected" is the real confirmation (DCP = dedicated charging port), and apparently also "VBUS STATE".

"VBUS STATE = 1 (USB host)" means the data lines are NOT shorted => max. current intake is 440 mA

"VBUS STATE = 2 (Adapter port)" means the data lines ARE shorted => max current intake is ~2 A.

Furthermore, keep in mind that power from the external source is prioritized to first supply the system, and then the battery. That is, the battery is charged with the "leftovers". Therefore, if you connect the Nook to a source from which it'll only draw the mentioned 440 mA, and you're continuing to use the tablet, then it can happen that the battery won't be charged, or even will be discharged! If you perform some CPU/GPU intensive tasks on the tablet, its power consumption can easily exceed 440 mA, meaning the tablet will use the external source in combination with the battery to satisfy its hunger.

TL;DR:

Nooks will only fast charge on dedicated charging ports, which are recognized by having their data pins shorted. That's more or less standard nowadays for generic USB chargers (USB Battery Charging Specification). However, some chargers still don't meet this requirement, and Apple has their own incompatible standard, naturally.

Don't use your tablet if you want to charge it from a low-power source (i.e. USB data connection on the Nook), because depending on the workload, the battery will be charged very slowly or will actually be discharged.
[Nook HD, HD+ Q&A, Help & Troubleshooting] modelworks:
Read page 19 of the document.

I just posted that for people to know the general section not as a specific example.

Page 28 of the document explains why the log may read 2036 but actually be 1.5A
[Nook HD, HD+ Q&A, Help & Troubleshooting] Tzul:
Have you read it? It's talking about the USB standard there rather than the bq24196. "If the portable device is attached to a charging port, it is allowed to draw up to 1.5A". That's straight from the USB standard, as the common USB2 connectors are rated for up to 1.5 A. However, B&N have engineered their own proprietary cable and connector and provide a 2 A capable power supply, so that limit doesn't apply.

Also, see Table 2 on the same page. The automatic input current limits are 100 mA, 500 mA, and 3 A. Not 1.5 A.

It would be interesting to open a Nook and take a look what resistor value they used for that safety setting, if they used one at all. As I said before, I've measured currents up to 1.88 A on my Nook HD+ from the official charger, so I seriously doubt they hardwired it to 1.5 A max (and wasted money by providing a 2 A power supply when a 1.5 A one would suffice).

PS: Do you know the power supply dir in the Linux SysFS? Check out /sys/class/power_supply/ and its subfolders (one for each power source). There you can find various virtual files, part of which contain monitoring values straight from the hardware, as read by the driver.

In /sys/class/power_supply/bq27500-0/current_now (or in the file "uevent" which contains a summary of the individual values) you can read the battery charge/discharge current, as measured by the PMU chip. I saw values above 1.7 A there last time I charged and checked. And in order to check, I had to wake up the tablet from standby, of course, meaning that some of the power was spent on running the system rather than charging the battery... All of this paints a pretty clear picture: the device really does fast charge at about 2 A (if you use a suitable power supply and if you let the tablet sleep while charging). Not 1.5 A.
[Nook HD, HD+ Q&A, Help & Troubleshooting] invinciblemo:
Just wondering how do you charge the battery externally?
[Nook HD, HD+ Q&A, Help & Troubleshooting] Tzul:
By opening the tablet, removing the battery, and connecting it to a dedicated Li-ion charger, of course. Something like this - but that's just an example, that model would not work. You'd probably have to do some soldering for the connector, too.
[Nook HD, HD+ Q&A, Help & Troubleshooting] invinciblemo:
I tried finding online to see if anyone had tried charging the battery externally.

It seems that dormouse1, from the second post in this thread http://4pda.to/forum/index.php?showtopic=431820&st=1900, had tried charging it using Imax B6.

I'm going to try charging my battery using his setup and see if it works.
[Nook HD, HD+ Q&A, Help & Troubleshooting] invinciblemo:
To anyone that is interested in charging their battery externally, i think a TP4056 a Lipo Battery Charging Board works.

I had managed to charge my battery, and it shows that it has a discharge voltage of 4V, but I am not sure if it is correct.

When my charged battery is connected to my tablet, the battery discharged and my tablet became hotter.

However, my tablet failed to boot.

So its either that my tablet is bricked, or the charger did not charge my battery properly.

I would like to ask does anyone knows, what is the voltage of a fully charged battery?
[Nook HD, HD+ Q&A, Help & Troubleshooting] Tzul:
Lithium-ion cells are typically charged to 4.20V. The Nook HD+ uses that value, too. Nominal voltage is 3.7V. I forgot the cut-off voltage that the HD+ uses to decide that the battery is empty, but I think it was 3.4V or 3.5V.
[Nook HD, HD+ Q&A, Help & Troubleshooting] modelworks:
To add to that, make sure you put a load on the battery if you are measuring the voltage of the battery disconnected.

Something like a single 330 ohm resistor would be good.

Bad lithium batteries sometimes will appear charged until you place the load on it then it falls to 2 or lower volts.

Another quick check is to make sure the battery casing is completely flat, if the battery has bulges of more than a few millimeters the battery is about to fail and should be discarded immediately. Another trick you can use is smell the battery, I know sounds weird , but failing lithium batteries have a very unique odor , almost sweet, reminds me of the smell of bananas.
[Nook HD, HD+ Q&A, Help & Troubleshooting] harrym1byt:
I have an HD+, which I have not been able to get to charge on a 3amp, 2amp or even a 1amp wallwart, but it does charge via its Nook wallwart. Does the above mean that were I to 'repurpose' a short USB extension and simply short the D- and D+ (clear of the +ve and ground) together in the USB lead, that I should then find it will charge via that lead? Please?
[Nook HD, HD+ Q&A, Help & Troubleshooting] Tzul:
Sorry for the late response.

Yes, that is correct, I have built such a cable myself and it does work.
[Nook HD, HD+ Q&A, Help & Troubleshooting] SkirraV:
Battery Issues

I have a Nook HD and it immediately dies as soon as it is unplugged, however there is no apparent damage to the battery, no bulges, leaks, or smells. After I plug it in and it reboots it goes from 10-20% charge to 100% charge within minutes. Is there a way other than removing the battery and charging it externally (outiside of my mechanical ability) to reset the battery to determine if it is a software issue or an issue with the battery itself. Currently running CM 10.2.1 stable.
[Nook HD, HD+ Q&A, Help & Troubleshooting] aromring@gmail.com:
Charging problem - solved

I had similar symptoms with my Nook HD+ : when plugged into charger the indicator light turned green, then orange, but only for a second, then went dark. When left on charger for many hours, the indicator would start blinking red. Nothing worked, until I read technical details in this thread.

The bottom line: if the battery voltage drops below 1.8 V, the stupid control chip assumes the battery is "bad" and refuses to pass the charging current; consistent with the observed symptoms. This gave me an idea on how to fix this:

Step 1: Open the Nook by prying the front panel to get access to mounting screws, then unscrew the back panel.

Step 2: Locate the battery cable composed of three red, three black, one blue, and one yellow wires.

Step 3: Locate the gold test points on circuit board _under_ the wires: "VBAT" under the red wires, "BAT-" under the black wires.

Step 4: You have to trick the control chip into "thinking" that the battery is still "good". For this, you'll need an external voltage source. I used my homemade adjustable DC power supply setting it to 2.5 V. I guess, any voltage between 1.8 - 3.7 should work.

Step 5: Connect the _positive_ lead from the external power source to the "VBAT" test point, connect _negative_ (or ground) lead to the "BAT-" test point.

Step 6: Plug your Nook into charger and wait a few seconds: the indicator light will now stay solid orange meaning the charging current is passing through. Yay! You should disconnect the external DC source; it's no longer needed.
[Nook HD, HD+ Q&A, Help & Troubleshooting] bubba198:
I can confirm that applying voltage to the test points does absolutely nothing. In examining the PCB the test points mirror the positive and negative connections of payload from the battery.

That is NOT how the charging chip works. There are 2 control lines tied internally to the LiPo battery which are NOT payload lines. That is what we need to play with but there's no information on how those control lines are tied into the cell's internal chemistry or what the expected levels might be for the chip to "think" that the battery is good. It could even be an interface, i2c or who knows
[Nook HD, HD+ Q&A, Help & Troubleshooting] flyboynm:
I guess I am in trouble then...

I found my Nook HD+ back after not having used it in 3 years. Battery is dead as a door nail. When I plugged it in though, it showed the battery symbol for a dead battery and then the amber light next to the cable connector lit up and is still lit 30 minutes later. I am going to let it charge overnight and hope that it works again. If not, I don't think I will bother with pulling the battery, etc.
[ONE Q&A, Help & Troubleshooting] rasik80:
I have just received the oneplus one with cyanogem mod 11 installed but I can't find the 4k video option in the video capture page.

How can I activate it?

Thanks!!
[ONE Q&A, Help & Troubleshooting] FilthyBrigand:
on the camera app, press the setting button on the right hand side...

then in settings slide to the left to enter the video settings...

the first options is about video quality.
[Nvidia Tegra Note 7] srcharged:
GPS performance and stability improvements.

OTA process improvements.

Android security enhancements and fixes.
[Nvidia Tegra Note 7] srcharged:
OTA process update.

That might just cling on my hopes for a new update nearby.
[Nvidia Tegra Note 7] vignesh_jariwala:
Hope

Fingers Crossed
[Nvidia Tegra Note 7] cars10k:
as usual not installable with cwm.

If u have cwm, thats what i did:

#1 dont do anything, just try to install the update (with cwm)

#2 this will fail, but it reverts to default recovery

#3 install again

#4 finish, now reinstall cwm
[Nvidia Tegra Note 7] kanekanekane:
Damn, Mine doesn't go into default recovery after Cwm fails to install the update.

There is a an error message which says that firmware is for 'tegranote', which is not compatible with the device which is 'tegratab', has anyone ever seen this error?
[Nvidia Tegra Note 7] Tomsgt:
super tool updated to 2.4.1 ota http://xdaforums.com/showthread.php?t=2627654
[Nvidia Tegra Note 7] nielo360:
do any of you have bad battery life in 4.4 or would you consider it normal and on par with 4.3 after the updates? I havent used 4.3 so it would be nice to know
[Nvidia Tegra Note 7] GR00VY GH0ULIE:
Battery life is ok... Probably be a lot better with ART but who knows when we'll get that!
[Nvidia Tegra Note 7] kanekanekane:
I had previously used superior to root my tablet.

If I use it again for the 2.4.1 update, will I loose my data, and have to setup the tablet again?

Thanks
[Moto X General] nickdez:
Is possible? Any question Stock Rom or AOSP?
[Moto X General] Darth:
With the limited Moto X development community and the issues that seem to plague the NON stock based ROMs....I'd say it pretty unlikely you'd see a stable miui for the X anytime soon.
[HTC One S] tomerrt:
Can someone get me a simple guide to supercid and s-off

(I can not with the other guides)

Because I want to install MaximusHD 10.0.0 and have hboot 2.16
[HTC One S] YoungDev:
http://rumrunner.us/rumrunner_downloads/

I didn't supercid my one s yet I got it to s-off after a few tries but it took about an hour on the PC. Just follow instructions on that website

http://rumrunner.us/rumrunner_downloads/rumrunner_HTC_0.5.0.zip This is the zip for the one s. Run into your PC and voila! Good luck
[JAMin, XDA Neo, S200 General] mil_house:
I was problem using shared folder in my server (windows 2003 domain)

Using resco explorer o file explorer ask me for user and password, normal, but cant access a good credencial, and this with my old 2020i works fine!

I try using IIS of my server publishing only for read and browse, my mp3 folder(backup files) to try to open it

If i use in pda pocket internet explorer i see the files and directorys but when i try to open it, try to download after open

I try TCPMP, and works fineeeeeeeeee!opening MP3 o Avi files with out download , and you can play a list!here is screenshot!

Anybody know some file explorer support that?

Thanks and sorry for my english

Regards

Nicolas
[Xperia Z1 General] daotrunglong:
Sony xperia z1 of Telecom Germany is updated new firmware. i dont want to lose root but im going to update and i info about the changelog later.
[Xperia Z1 General] E620se:
Can't see anything here.
[Galaxy Tab 3 Q&A, Help & Troubleshooting] wesmagyar:
I have the tmobile version of the Galaxy Tab 3 , I've been doing some searching and I haven't really found much information on rooting installing CyanogenMod on this tablet.

I've read from some people that you can run the Sprint version of the roms on this tablet. But I haven't found a whole lotta info on that.

Being forced to run the ancient version of Android on this thing is really bugging me. A Lot of the apps I like to use don't work so any help in getting up to a more modern version of Android would be appreciated thank you in advance.

-Wes-
[Galaxy Tab 3 Q&A, Help & Troubleshooting] jacobs005:
I second this post.
[Galaxy Tab 3 Q&A, Help & Troubleshooting] wesmagyar:
Really nothing helpful yet?
[Galaxy Tab 3 Q&A, Help & Troubleshooting] jacobs005:
Apparently no devs out there purchased their tab3 from T-Mobile. Ah well, still a decent tablet.
[Galaxy Tab 3 Q&A, Help & Troubleshooting] wesmagyar:
It seems that way, it suck's....
[Galaxy Tab 3 Q&A, Help & Troubleshooting] tgalal:
Not much attention was given by developers to Galaxy Tab 3 or the current Tab 4 series in my opinion
[Galaxy Tab 3 Q&A, Help & Troubleshooting] Toneman07:
I'm in this boat too. The only thing I've found useful for t217t was a debloat mod. I was hoping I could upgrade this this to 4.4.2 like my c916
[Galaxy Tab 3 Q&A, Help & Troubleshooting] FarmR:
Which debloat mod did you use? I have the t217a and I'm hoping your method will work for me too.
[Galaxy Tab 3 Q&A, Help & Troubleshooting] pqx:
without root android users suffer the adware flavor of malware

I won't use andriod without user root to ensure privacy via my right to AdBlock or prevent analytics harvesting. Back to amazon with it.
[Galaxy Note II Q&A, Help & Troubleshooting] DiogoCV:
Hi folks!

This problem has been following me since this camera from Google appeared. I love taking spheres and panoramas.

Google camera(from Google play) crashes when trying to use photo sphere or panorama.

I have a note 2 LTE (t0lte) running stock Samsung rom(kitkat 4.4.2) no custom kernel, just rooted and deknoxed.

Has anyone experienced this already?

I tried to Google about this and searched here in xda but couldn't find any thread related to this.

I have 2 screen shots about this. If I gave poor information please

tell me what more info about this I can get from my phone.

Many thanks in advance, I hope anyone can help me.

Thank you.

Cheers
[Galaxy Note II Q&A, Help & Troubleshooting] Azhery:
its common issue..i hve this problem too..
[Galaxy Note II Q&A, Help & Troubleshooting] DiogoCV:
Is there any solution, any way to overtake this crash?

Thank you
[Galaxy Note II Q&A, Help & Troubleshooting] Azhery:
i dont know..i think we should wait for update..why dont try oneplus one camera..work great on note2..
[Galaxy Note II Q&A, Help & Troubleshooting] DiogoCV:
I've just tried the camera next, same problem changing to panorama..

Could you please point out the link you used, or could you share your apk?
[Galaxy Note II Q&A, Help & Troubleshooting] Azhery:
if try on smsung stock rom..u'll get fc on panorama..but on aosp..work great..no fc..
[Galaxy Note II Q&A, Help & Troubleshooting] DiogoCV:
Ok, thank you. But I ment only about the stock rom 4.4.2 kitkat from Samsung, for this rom if there is any other option for me?

Thank you
[LG Optimus G (International)] Javier_Vzla:
As many of you may have noticed, google android gave excellent news for L (4.5 or 5.0) has a new interface, new keyboard, ART runtime, Project Volta and endless deployments to the system, from my point of view, this will be, so far, the update with more changes to date, and I see a great future in android.

Q - What is your opinion about this update?

Q - Our Optimus G will be able to get this update? (Obviously not by LG)

I make this post since no one around here seems excited as I am

Write your review below :D :highfive:

Sorry my bad english, I'm using the google translator
[LG Optimus G (International)] dars2:
i think its a really good update, the change from android 2.3 to 4.0 was good but android 4.0 was sad too much black, too serious. this version reminds me of samsung : childlish colors, big things... i would like a more serious os but whatev... im really excited about that update i think its gonna be good, I want it!
[LG Optimus G (International)] Javier_Vzla:
that's true, black is not it look bad, but bored after a while, for me, the new look is "solid", and most of all simple, I'm excited, because maybe, improving performance and the battery life due to ART, is significantly better than kitkat
[LG Optimus G (International)] hasan4791:
There is also a reason y black has been chosen..to reduce t battry consumption...also it wrks well in case of amoled screens...
[LG Optimus G (International)] dwielunski:
I like the L look but I also like the new LG interface from the G3. Remember you will get most of the L features as updated Google apps roll out. Once the Nexus 4 has this update it will be pretty straightforward to get it on the Optimus G. But I think the best solution for this phone will be: official KK, root and theme to get G3 features, and use the redesigned Google apps as they come out.
[LG Optimus G (International)] Duo8:
I'm expecting CM12 late this year. The new UI looks great.

Surprised to see so many excited for ART.
[LG Optimus G (International)] kt-Froggy:
Absolutely agree with this. I'd say not necessarily the official KK, but stock-based, like Sling or VDT. Personally, I don't like the L look, from what I've seen. Some components are just plain ugly, for example, the keyboard. To each their own, I guess...

As for ART, the dealbreaker for me is Xposed. When it starts supporting ART, it will make sense to upgrade. Until then, no.

Well, for LCD screens, the difference is very marginal, if not negligible, since the backlight is the main power sucker. Only AMOLED will give you a measureable power saving when using black.
[LG Optimus G (International)] Javier_Vzla:
I hope Android L, as I read in the forum the nexus 5, the battery life has drastically improved, 2h SOT (Screen on Time) to 4 + to some users says 7 hours of screen time

and overall performance is more buttery and solid

I'm excited, hopefully developers porting nexus 4 to achieve, then our talented developers can port it to Optimus G

Excuse my bad English, I'm using google translator
[LG Optimus G (International)] dark_prince:
I love the professional UI. I'd love to have a stock Android L experience if it ever comes to O.G