[ONE Accessories] Inkazzo:
Now im able to post pics.

There is still a little problem you can see on the last pic. The phone wil yet not regognize the full capacity, the result is a to early shutdown. But i think i alredy got a sultion, but before telling you i have to be shure.

I did order the batteries here but there are more Seller https://www.aliexpress.com/item/1pc...32758417342.html?spm=a2g0s.9042311.0.0.igK7BU

Here build process and proof of my 5 batteries:

First the Build steps:

1. Capacity Test:

1-1 test setup with my SkyRC MC3000 charger 4 batteries in charge/discharge progress

Charger battrei setup www.dropbox.com/s/r56f45k4aykmuqz/IMG_20171231_130928.jpg?dl=0

1-2 Results from 4 batteries with each 5 tests cycles :

https://www.dropbox.com/s/6ga1y2jirpj807j/IMG_20180104_212018.jpg?dl=0

2 ZTE/OPO MOD Build process

2-1 ZTE accu with disassabled controller (only lithium cell left with self soldered cable)

https://www.dropbox.com/s/j80ghu1bsovudxg/IMG_20180106_152113.jpg?dl=0

2-2 Final ZTE-Mod with soldred original OPO BMS controller on it

https://www.dropbox.com/s/s6q1wkt8vrnqziw/IMG_20180106_153641.jpg?dl=0

here you can see closer look on how a original Oneplus controller has to look like, with a visible temperture sensor (little black cable left side)

ZTE wit OPO MOD Controller finish colse https://www.dropbox.com/s/ypuv8qrurdoh1ye/IMG_20180106_153714.jpg?dl=0

3. First and Second Test 07.01.2018 and 09.01.2018 with results build in phone:

3-1. Result 3839mah USB battey meter (phone was on while charging but in airplane and energy saving mode)

First charge measurement USB Meter https://www.dropbox.com/s/3zx2m0388d8y6lk/IMG_20180107_075746.jpg?dl=0

3-2. Results AccuBatterie APP (sorry for german app language)

Firts run in phone with SOT time

Accu batterie volt and temeperture https://www.dropbox.com/s/re0z804y4melr78/Screenshot_20180107-075650.png?dl=0

Discharge and first Charge result in mAh App accubatterie https://www.dropbox.com/s/kfdtuuwd76izfbj/Screenshot_20180107-075707.png?dl=0

Second run 09.01.2018

USB Meter result 3758mah

https://www.dropbox.com/s/uv8w786n7frthsr/IMG_20180109_003125.jpg?dl=0

Accubetterie APP

Voltage with estimated SOT time

Accubatteri Volt and SOT https://www.dropbox.com/s/smbxeooiphy7nqh/Screenshot_20180109-053832.png?dl=0

Here is my last result 3812mAh and a my little problem (irregular percent jumps up after restart) visible. The the batterie Gauge is showing 0% and the system shuts down but the battery has still 3,7 Volt (3,30 is min) and this is about 35-42% (1500 mAh) rest capasity. After this shutdown you are able to restart the phone and the gauge is jumping up to from 15 - 51%. Maybe the system has to calibrate first (it is fresh installed) so i will come back later maybe with a workarrouand.

https://www.dropbox.com/s/ou4dsjwtt5pi1fd/Screenshot_20180109-003720.png?dl=0

it is not so hard to do the ZTE OPO batterie MOD. Look at the youtube link below.

Short tutorial

1. You have to take away the Isolation from the upper side of both batteries.

2. Marke the + and - pole sides! (on the orig controller the minus conector is marked with a "B-")

2. Cut of both controller (do not short circuit with the scissor)

3. Solder on a short thin cable on both sides (do not short circuit)

4. Solder on the new controller. (do not short circuit

5. Isolate the controller and put it back in your phone (Your phone will not start at first you have to plug in the Charger cable and now it will)

Update 14.04.2018

I did find an easy work arround to be able to use the full capacity. If you open and edit this file "sys/class/power_supply/battery/capacity" and write in a value "50" (without ") for example the batteie gauge sticks always at 50%... This will help against too early shutdowns. I recommend to istall the APP "Voltige Notifier" and manually shut down whenn 3,5 Volt is exeeded or use Tasker with these settings from [MENTION=3729682]I_did_it_just_tmrrow[/MENTION] !

So no need for an Moded Kernel

Update 17.04.2018:

im still getting about 3800mAh real usable capacity this equals to about 8 - 9 hours aof screen on time/SOT and 45-55 hours standby (Wifi and BT always on)

Update 11.07.2018

After month of using my 4000mah (real 3825mah) ZTE-Mod (with my original OPO BMS controller ) i can say it works and i still get 2 days wihout charging but i have t say there is a BIG problem. There is a chip ( BQ27541 fuel-gauge chip) on our motherboard( the BMS dont matters)wich got a wear leveling algorithm wich can not be resettet by us (only Oneplus). Everey time my phone was going to 0% i could restart (without charging) and got 20 - 60% rest batteri but every time i did this the BQ27541 fuel-gauge chip algorithm virtually shrinked my maximum capacity. After 3 months of reaching 0% and restarting and hoping the algorithm will recognize the new bigger capacity i was then on 140mah! rest capacity (or better to say the Gauge chip is telling this). The only workarround i find was to set the batterie gauge hard fixed to a value between 1 - 100% to use my full 4000mah capacity. To do this you will have to edit and savethis file "/sys/class/power_supply/battery/capacity" after a restart this setting will be lost nad has to be redone, root rights are needed.

Now i would recommend if you change yor batteri to a new or bigger one (original BMS or not) try to never reach the 0%= autoshutdown maybe the gauge chip will recognize the new capacity in your case. To know now when i have to charge is by the voltige (3.5v) wich i can see because of an istalled app named "voltige notifier".

If anyone knows how to reset this chip link http://www.ti.com/product/bq27541# please tell me i will try it

To check your calculated max capacity by the controller you have to open this file with a txt.editor "/sys/class/power_supply/battery/charge_full_design" (you my need root rights)

To use the full capacity a set the accu gauge to a fixed value you have to edit this file txt.editor "/sys/class/power_supply/battery/capacity"

Or if you using an terminal you need this command "dumpsys battery set level 50" (cat /sys/class/power_supply/battery/capacity)

I hope you can understand this, caus it is very hard to explain!

Here are some usefull Links for the MOD:

Long video how to mod

How to use tasker to autoshutdown when low voltige is reached

How to from the user I_did_it_just_tmrrow wit some help to determine if your ordered battery is fake or original

END