yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] freakadell:
So now i hav tryed the nexus without the battery aswell. At first i applyed 5v directly to the little black battery connector. tablet worked but showed 0%. Then tryed desoldering the batteryback from the little circuit and applyed 5v to the actual battery connectors on the circuit. It shows 100% battery and works and also the temperature sensor is working. One issue is that i need to plug in the charger before connecting the circuit to the motherboard, maybe the charger im using is just too weak that cant get the voltage up or something. And another thing is that i left it plugged in for the night and now the percentage goes down slowly as it would be discharging. havent figured out why that is. Maybe someone has tackled this before also?
[Nexus 7 Q&A, Help & Troubleshooting] videogame57:
You supplied power to the protection circuit? I'm surprised that worked.

The battery is probably going down because the protection circuit is designed to prevent over and under voltage. Since you're feeding it 5V and a lithium battery is supposed to max out at about 4.2V it must be trying to lower the voltage somehow. The percentage going down is probably nothing to worry about, but I'd strongly recommend connecting to the battery connector instead, and only connecting it like this when you need to have a certain percentage to do a system update etc. Also be careful with the bare battery, if the two pins short it could catch fire.
[Nexus 7 Q&A, Help & Troubleshooting] grossy34:
Hi i tried that works ,however it doesn't boot when powered i have to turn it on pressing power button,any idea why?

As a car dash its pretty useless now
[Nexus 7 Q&A, Help & Troubleshooting] dribbleboy:
Just a quick message that I have managed to power my nexus 7 2012 from a USB cable connected to the circuit board that was attached to my dead battery. Battery level indicator is permanently at 100%.

Sort of like the above it involves using the battery circuit board but it is disconnected from the battery.

Step 1: Strip back battery wrapping revealing the board attached to the connector cables (that connects to Nexus 7)

Step 2: Cut the metal strips going from the circuit board to the actual battery part

Step 3: Solder USB cable Positive wire to board pad labelled VP and Negative to pad VG(? not 100% on last one, but it's the other pad)

Step 4: Solder short wire from VP pad to other side of the board onto the ++ pad (that goes to the red wires then connector)

Step 5: Wrap board up with elec/other tape to avoid shorts

Step 6: Connect up and power on

Not sure why the last wire is needed but it didn't work for me without it.

Next step for me is to wire it to the onboard micro-usb
[Nexus 7 Q&A, Help & Troubleshooting] ospram:
Where is the ++ pad ??

Where is the ++ pad mentioned in step 4 ? Can you post some pictures ?
[Nexus 7 Q&A, Help & Troubleshooting] gauresphere:
[MENTION=4987521]ospram[/MENTION] - Any luck with running your nexus 7 without battery @ 100%? I have a Nexus 7 2012 installed in my Toyota corolla which works great except random battery issues. I have tried both Auto Droid and Timur's USB ROM but it looses battery over a period of time as I use GPS a lot. So I want to take out the battery completely. Here's a video I found that tells how to run Nexus 7 2013 without battery.

https://www.youtube.com/watch?v=9N2Bh4fI8Bo

The uploader has connected a short wire from VG to the black wire (--pad) at the connector but [MENTION=7116492]dribbleboy[/MENTION] suggests to wire it from VP to ++pad wire i.e red wire.

Have you tried this?
[Nexus 7 Q&A, Help & Troubleshooting] gauresphere:
Posting update for anyone who is interested and trying to do a similar setup. I was able to power on my Nexus 7 2012 without battery. As suggested in the video I had to connect a short wire from VG to the black wire(--pad).

But now Nexus 7 doesn't detect power from the micro USB port when I plug in a USB cable. However, I am able to plug in USB keyboard / DAC etc.
[Nexus 7 Q&A, Help & Troubleshooting] DarkN3ss61:
Anyone got any updates on this?

I am about to attempt this myself

EDIT:

Also not sure if I am alloud to post this link but users over here are trying to fix this issue

http://n7carputer.freeforums.net/thread/3/battery-mod
[Nexus 7 Q&A, Help & Troubleshooting] dribbleboy:
Just got an email notification that this thread was active, I was the dude who got it going by powering up the battery controller board. There was a problem I found in that I think the software used to track the battery level wound down the indicated charge over a couple of days. A disconnect and reconnect of power cable the usb power feed fixed the reading with a "FULL" charge level when it came up. I had this going for a month on the benchtop with no problems.

Do NOT try to power the battery controller board from the base USB port (or pogo for that matter) while it is connected to the main board. I think there's some earth loop issues and I killed mine.

Happy Hacking!
[Nexus 7 Q&A, Help & Troubleshooting] DarkN3ss61:
So are you saying powering your batteries circuit board (without the battery) and "charging" the nexus through the proper usb port at the same time killed your tablet?
[Nexus 7 Q&A, Help & Troubleshooting] donjamal:
ever since i've done this mod, my nexus 7 sometimes powers on, sometimes it doesn't. sometimes the screen goes all black or white and i have to restart it. then again, whether it starts or not, that is a different question...
[Nexus 7 Q&A, Help & Troubleshooting] donjamal:
okay, this seems to be fixed by flashing a different rom. now the other problem is, that if i switch off the ignition the tab goes off as well. then i turn the car on again, and the tablet does not turn on. i bring it home, plug it into the charger, it works fine then. what could be the issue here?
[Nexus 7 Q&A, Help & Troubleshooting] dribbleboy:
[MENTION=5523365]DarkN3ss61[/MENTION] : Death was when I multimetered out where the voltage was coming into the backplane on the nexus mainboard (from the bottom usb port) then soldered wires from those points to the back end of the battery ++ --

[MENTION=2313795]donjamal[/MENTION]: Can you turn it back on via th power button when you turn car back on? Sounds like you're wired to the accessories +12V in the car that comes and goes with the ignition keys. Cig lighter are generally wired from accessories.

You'll have to look for the always on 12V which in my car accessories is yellow and always on is red (From the rear of the stereo).
[Nexus 7 Q&A, Help & Troubleshooting] DarkN3ss61:
[MENTION=7116492]dribbleboy[/MENTION] Oh, so if I understand correctly, just powering the tablet via 5v usb from where the battery would normally be in the back and then using the charge port on the bottom to detect if the car is on. My tablet should be fine with that?
[Nexus 7 Q&A, Help & Troubleshooting] dribbleboy:
I had mine powered and connected to usb ok but personally from losing my tab I would only have it being powered from one source.

Also remember that when you pull the power when it's running you're crashing an OS that wasn't meant to stop this way.
[Nexus 7 Q&A, Help & Troubleshooting] ARK786:
thinking to put a nokia battery except usb

Hello man ur idea was awesome i am thinking to put a nokia battery except usb and then i will conect nokia charger female pin so then i can charge the battery with nokia charger and my tablet will work....osnt this great idea....u can reply me on gmail....adilraufkahara4@gmail.com...have a great day
[Nexus 7 Q&A, Help & Troubleshooting] samnangseng:
I have followed the instruction and it work with my n7 2012 with/without battery.
[Nexus 7 Q&A, Help & Troubleshooting] mcgrumpus:
Ive tried to get the no battery mod setup. It works to power the tablet but I can't get it to recognise my OTG cable with external power. It was all working with the normal battery / charger setup. But that battery died one day and wouldn't come back to life!

My setup is:

USB to Battery connectors (with the extra wire soldered from the -ve to the outside black wire on the battery connector). This looks like it works but I get 0% on the battery rather than 100% others are reporting.

USB to Y Split Cable - this has my usb powered hub on it with the DAC and a flash drive. This was working on the battery powered version of this install but now doesn't

When I connect power to the OTG it seems to power cycle the tablet. It flicks between FI install active and not. Then it goes to the shut down screen video and / or crashes. Is it worth removing the extra wire from the -ve to the black wire and run it to the +ve instead as mentioned in this thread?

Thanks for your help it is much appreciated!
[Nexus 7 Q&A, Help & Troubleshooting] steven0123:
I've got a similar problem to mcgrumps.

It was working fine with the battery however, once i did the no battery mod the tablet won't wake up from suspend/sleep mode when it receives power from the micro usb. Any advice?
[Nexus 7 Q&A, Help & Troubleshooting] tb2007:
So it seems we found a way to power the device with the battery showing at 100%.

However, have we've found a way to keep USB device mode working (to flash roms)? The mention of it was with gregersrygg original method of using the Pogo and then use the battery when he needed USB device mode.

I'd like to perform this on my 2012 but want a way to retain USB to flash roms in the future.
[Nexus 7 Q&A, Help & Troubleshooting] Mariua123:
Are you all using a custom rom? I'm on stock rom 4.4.4 Nexus 7 2012. I'm through the procedure like explained in the video, but Android isn't starting completely. After the google Logo it ist not going further through the boot process. Any suggestions?
[Nexus 7 Q&A, Help & Troubleshooting] tevil:
Hi I found this thread loking at some problems with my brother and I's N7's. We know theyre old but they are good sturdy backups.

Id like to try this as both our batteries have been funky and now niether tablet boots.

Which pins are the 1st and 4th? does the first start on red or black?

Thanks
[Nexus 7 Q&A, Help & Troubleshooting] Armin61:
I will share my experience...

What I did is solution for N7 2013 as someone earlier suggested...

take out battery, strip it and remove power cells from battery circuit.

Then solder + (red wire) and - (black wire) from your USB cable to + and - on the battery circuit.

Then take piece of wire and connect - (black wire) from your USB cable with any of the two black wires connecting battery circuit to the board (you can use soldering points of these wires to the circuit board to connect them).

And use charger with minimum of 2Amps output. Any weaker will give you bootloops.

I use this method for my car setup and the N7 is powered on all the time. I used some relays to turn on and off the screen with ignition on/off with some power button modifications.
[Nexus 7 Q&A, Help & Troubleshooting] molnardk:
Hello everyone

I tried this mod (remove battery, red to red black to black wire without the small PCB)

When I plug in the charger, and I try to turn on the tablet, there is a little screen slash(about 0.2 second) and after that nothing, no boot or anything.

Can someone help me with this?
[Nexus 7 Q&A, Help & Troubleshooting] molnardk:
Hi, I am again.

I managed to boot up the tablet, with a direct 4.2V on the board, and power from the micro usb port(without one of them not a single signal to boot up, so I have to use two charger to boot).

After attempt to boot, it goes to boot loop. When the os should be loaded(a little more bright on the screen) it restart and try to boot again. So I have bootloop.

Anyone knows why I need two charger? And how I can get rid of the bootloop?
[Nexus 7 Q&A, Help & Troubleshooting] aussie0Z:
I've got mine booting with a 5V, 2.1A car charger. Battery says its full the way I've wired it in "first time soldering BTW lol" only problem I've encountered is trying to change USB configurations from charging to MTP, it just freezes and restarts its self
[Nexus 7 Q&A, Help & Troubleshooting] aussie0Z:
I did this and have a saying I've got a full battery and boots up
[Nexus 7 Q&A, Help & Troubleshooting] Snake Scaly:
Here's my modification. Thanks to aussie0Z for the idea to use the PCB board from a dead battery. Essentially I faked the battery's power by tapping into the 5 volts from the board. This does not require any new connectors nor the case modification. It does require a bit of precise soldering though.

The tablet thinks that it has a fully charged battery when powered over USB. Unfortunately my PC does not see the tablet when connected, even though the USB power is enough for the tablet to work. Maybe I fried my USB circuit while experimenting, I'm not sure.
[Nexus 7 Q&A, Help & Troubleshooting] vestaviascott:
Thanks for sharing the pics. This looks like a clean, nice solution. I have a spare "parts only" N7 coming in the mail and I'm deciding which "no battery" mod to try first. I'll need to connect an OTG device (a Carplay adapter dongle), along with the USB power source to the micro USB charge port. Should be no issues with this setup with the proper OTG adapter cable/splitter?

Curious if anyone else has tried this mod and can confirm.
[Nexus 7 Q&A, Help & Troubleshooting] santi1993:
you cant put a protection diode in series with the power lane and it will reduce the voltage 0.7V, maybe it helps you.

that will also prevents the battery circuit to give inverse current to the pcb (charging), maybe it fried ur usb controller, its a win/win putting a diode in series.
[Nexus 7 Q&A, Help & Troubleshooting] nadrat24:
Do anyone have some solution what to do to get n7 working properly and still have working usb otg? I want to instal my n7 in car but i need to remove the battery- when it gets really hot i dont wanna fire in my car :C
[Nexus 7 Q&A, Help & Troubleshooting] Dreamer...:
I trying to make N7 as carpc

All work fine except booting witout battery (battery removed and power sets to ++ and -- pins from DC-DC)

When i try to Power on I get: Google logo - long time wait - screen off - Google logo - twrp recovery

I think its kernel issues

i try kernel from this rom https://xdaforums.com/nexus-7/orig-development/wip-linux-tegra-nv-3-4-bringup-t3128195

and its stuck on bootanimation

Can you help me?
[Nexus 7 Q&A, Help & Troubleshooting] 2i3r:
On my experience, boot loop can be a result of not delivering enough power to the board and then voltage drops, e.g. low power supply connected to the board < 2.1A.

-------

I'm going to do something similar, I love my old n7 2013 LTE, and I did battery replacement before, not much luck with new replacement batteries as they have very low quality and loose their power in a short period of time.

In the last year, phone brands release lots of new phone/phablets which ship with a much stronger yet smaller batteries such as Samsung galaxy A42, A12, M51, etc.

I thought to have better luck with new phones battery replacement as the they have official service going on for a while.

With such great experiences in this thread to replace battery with 5v DC voltage, I'm hoping to be able to replace my dead battery with another LiPo battery from another phone/phablet.

I'm planning to de-solder battery protection from n7 dead battery and connect those exposed connectors to tracks on new battery output. then it would have a series of two protection board, one from old n7 dead battery and another the one which ship with new battery. I can't see any problem with that, do you think it's ok too?!

I'll really appreciate if you guys have any tip on this.

Hope you going well in this pretty hard period of time.
[Nexus 7 Q&A, Help & Troubleshooting] Renate:
Nah, don't do that.

The only real reason we use the protection board is so that the stock software will have something to talk to.

I've been running my N7 (2013) for months now with regulated 4V into the battery contacts on the BMS.

I've found it to be a bit balky and sometimes it needs to "charge" (i.e. get power in through the USB) before it wants to power on.

I've added the extra wire like everybody says.

The battery positive contact on the BMS connects directly to the two red leads on the motherboard connector.

The battery negative contact on the BMS connects to a MOSFET(s) that connects to the the two black leads on the motherboard connector.

The extra wire bypasses this MOSFET(s).

On the N7 (2013) a handy place to connect this wire is on the two solder dimples near the two black leads on the motherboard connector.

The other end goes to your power supply black wire.
[Nexus 7 Q&A, Help & Troubleshooting] Chris_T1:
Hi,

I carried out this mod, by removing the battery and soldering wires to the battery protection strip. It works fine, except that I see battery drain - starts at 100% then slowly drains to zero, when it shuts down. Once restarted it is back at 100%. Anyone else experience this, and is there a solution?
[Nexus 7 Q&A, Help & Troubleshooting] fredfred41:
Hi, I'm planning to resurrect my old ME370T to use it as a home assistant dashboard.

Has anyone already done this?

Will it still work in 2023?

What was the last stable and fast enough Rom, I could flash on it?

Thanks a lot!
[Nexus 7 Q&A, Help & Troubleshooting] Ahkah:
Use AndDiSa's ROM, and try to avoid the gapps.
[JAM, MDA Compact, S100 General] pesesse:
Hi I just received my new Qtek S100,does anyone know of freewares that run smoothly on the S100.I need something that closes the programs instead of minimising and also a battery and memory bar.Thank you for your help.Xcuse my poor english but I am from Belgium.Have a nice w.e.
[JAM, MDA Compact, S100 General] Grunt:
It is not free but Spb pocketplus does exactly what you want with a significant amount of style.......

You spent heaps on the gadget....you might as well blow a little bit on the software.......

It is available at Handango.
[JAM, MDA Compact, S100 General] :
Try All Close

I installed Close all and linkt it to my camera hardware button - works for me. http://www2r.biglobe.ne.jp/~tascal/download/pocketpc/closeall_e.htm
[JAM, MDA Compact, S100 General] bamse:
Or you might want to try this one:

http://www.freewareppc.com/utilities/vbar.shtml
[JAM, MDA Compact, S100 General] @ngel:
Pocket Nav

is another cute alternative to Pocket Plus.

Bye!
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] GrapeBandit:
ive been messing around running the "power saving mode" for the past 3 days. its supposed to underclock tbe processor, I can confirm it does not and my battery life is basically identical to "non-power saving mode". it still runs to 1890mhz and I get the same 4-4.5hrs kn screen time on a full charge. is this a big crock of BS or is it my phone? anhone else try this and have the same issues? thanks in advance
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] CAG-man:
Same for me. Im trying out BatteryGuru now.
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] GrapeBandit:
yea this is tbe built in one in the settings. doesnt do dik! lol
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] CAG-man:
Yep. I meant to say I tried it too with tje same outcome. Hoping the BatteryGuru works.
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] GrapeBandit:
well I figured it was going to cut down the mhz like it says, but thats not the case. ill just root my phone when I get home from vacation and mess with it a little more..probably just mess with root at first to underclock&undervolt then remove the bloatware I have disabled, plus a few tbat you cant disable. all before I install any custom roms.
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] Tinag379:
I've had it on since I got the phone Monday and I'm at 8 and a half battery life
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] GrapeBandit:
whats does that mean? 8 and a half battery life. lol
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] jd1639:
All the battery saver apps are crap. Use better battery stats and learn about wake locks and how they effect your battery life. That's the only way you'll get better battery life. There is an excellent write up in the i727 forum
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] GrapeBandit:
I dont have battery life problem, was just seeing if I can get more out of it. I installed better battery stats last night and it takes a few days for tbe readings to be accurate, so it claims. ill see if I can find that thread in the i727 section. thanks
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] Tinag379:
My bad. I meant 8 1/2 hours battery life.
[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] GrapeBandit:
hows this? just captured this before i plugged it in to charge
[HTC Sensation XL] davitdavtyan@gmail.com:
I just found this interesting and wanted to share about this power button app as to preserve your power button from using too much.

Here is the app that I use a lot to switch off display and it does not drain the battery.

https://play.google.com/store/apps/details?id=com.katecca.screenofflock
[HTC Sensation XL] evilcowhunter:
The link is broken, But yeah i noticed if u do not turn Google Now on your battery is likely to last tiny bit longer :good:
[HTC Sensation XL] davitdavtyan@gmail.com:
re-uploaded and now is working.
[HTC Sensation XL] jjaagg:
Hi

I successfully repaired volume button using flex from HTC HD2 which is available for reasonable price.

So now I do not care if one day my power button will die because I still have four spare micro switches.

Cost of repair is next to nothing.
[Sprint Samsung Galaxy S III] stealthdave:
I'm running the latest nightly of CM10.1 (6/5/13) on my d2spr, and I want to be able to hang up on a call using the button on my bluetooth headset. I have a Jawbone ICON headset that pairs successfully both for calls and A2DP, but the button no longer does anything on CM10.1. On stock TouchWiz and my old iPhone, pressing the button during a call would hang up on a call, but not on CM10.1. This issue has been present for me since I started using CM10.1 when they released RC1 a few weeks ago.

I've had this functionality with other AOSP ROMs (it worked on the AOKP ROM that I was using for a time, but that developer no longer has a Sprint GS3). I haven't been able to find any settings that would enable this. I've also looked into using Tasker for this functionality, but I'm not very familiar with Tasker yet, and I haven't yet found a way to trigger an event from the Bluetooth headset button.

Any help would be greatly appreciated! Bonus points for tips on using the Bluetooth button for other actions, such as pause/play media or long-press for voice dialing, etc.!

Thanks,

- Dave
[HTC Sensation] lukasrb:
Hi to all. New here but have a lots of problems with my sensation. Bought sensation 1 month ago (second hand). Since i got it, it was bit slow and lugish on stock ics so i unlocked bootloader and instaled hd revolution rom. Things got bit better but screen sudenly got predominantely green color. It worked like that for a day than returned to normal. It was all fine until yesterday. Screen got this time predominantely red colour and later changed to pink and finaly stuck on blueish. It look completely unnatural. Cant watch videos or pictures on it, or do anything. Could be that signs of duying screen or digitizer perhaps?? Dont know what to do, for sure this is my last htc.

Thanks:mad:
[HTC Sensation] Skipjacks:
It certainly sounds like hardware failure. The last time I saw behavior like that on an LCD screen it was because the ribbon connector that connected the screen to the motherboard was loose and shifting a little in the connector. That was on a completely different peice of hardware, but the result was similar to what you are describing.
[HTC Sensation] lukasrb:
Thanks

Thanks mate. Already tryed opening and cleaning dust, disconecting ribons and reconecting but didnt help so far, may try again. Thanks anyway brother:o