[Samsung Galaxy S7 Questions and Answers] AYBFunkyMonkey:
Not sure if I should post this as a question or create some sort of project thread, but I do have a few questions at the end, so I'll put it here for now.

I have an old Samsung Galaxy S7 (SM-G930V), and have started working on constructing something that will allow me to power it without a battery. I have a multimeter and I'm not afraid to use it! ;)

I have gone through some previous threads I could find on a similar subject such as:

[Q] how to run a phone without battery only by connecting charger

[ Guide ] power Samsung phone without battery

First of all a bit of background. (You can skip this paragraph if TLDR) Since my Galaxy S5, I have used my phone constantly during the day to play a semi-graphics-intensive mobile game, which much of the time is spent idling with the game on and the phone laying on my desk. I have been playing it literally every day since. Years ago my S5's battery swelled up, and I was ready to upgrade anyway on my Verizon plan so I got an S7. It lasted for roughly 1.5 years until last week when I noticed the screen and back were swollen. It had started to bow out the front screen and rear glass, and peel them away from the phone. The screen still worked normally however. Anyway, a few days ago I upgraded to the Galaxy S9 (Yea I know I'm falling right into their planned obsolescence scheme :rolleyes: ). So I would like to turn my S7 into a stationary gaming device to play this game and not burn out the battery on my new phone like I did to these last 2. (I have tried Bluestacks in the past but this game requires a lot of scrolling through menus of gear, heros, levels, etc, and the scrolling on Bluestacks was abysmal using the mousewheel or dragging across the screen with the mouse pointer.) I believe leaving them plugged in to the charger while constantly running this game likely caused the battery failure early. Also, I would rather not try this on my Galaxy S5, since the battery can be replaced easily, I can still use it as a replacement phone if needed, and it would not run the game very well anymore.

Anyway, on to the start of the project! Unlike my S5, the S7 does not have an easily removable battery, so I followed this guide mostly to remove the battery. I did not have any of the fancy heat stuff, but with the back already half popped off from the swollen battery, I was almost able to completely remove it with a screwdriver, but then it shattered on the last corner and sent flakes of glass flying everywhere.... well, I got the rest of the guide completed and the components/battery removed. Here is what I'm left with: [IMG="Disassembled S9"]https://www.dropbox.com/s/oi9ms7liy7g8j9z/s9open.jpg?dl=1[/IMG] [IMG="S9 Battery"]https://www.dropbox.com/s/ycsr777cnebg2yf/s9battery.jpg?dl=1[/IMG]

First I tried the obvious test, and plugged the S7 into its usual charger. The battery charging icon flashes briefly on the screen, then goes blank for a few seconds, and repeats this pattern. If i push the power button like normal to turn on the phone, the Samsung startup screen flashes briefly on the screen and off again, and it resumes the flashing battery screen behavior. So I purchased a variable voltage adapter from Amazon to try to use for powering directly to the battery terminals inside the phone. I can move the slider to change voltage quite precisely according to my multimeter (unfortunately there isn't any display to see on the power supply itself), and since the battery is labled 3.85-4.4V, I've got it tuned to about 4.35V currently. The amperage reading at this setting shows 3.45A. So I can tell the lower voltage the slider is set to, the higher the amperage reading is. This should be plenty of power, and get around the issue most of the articles I found had where they tried to re-purpose USB connectors, which only put off about 500mA.

Now the first problem I have run into, is the connector on the S7's board for the battery is tiny! I'm going to label the pins now with my terrible paint skills for the multimeter resistance test later:

[IMG="S9 battery connector"]https://www.dropbox.com/s/kz9i7osekh9kv9n/s9bconnectlabel.jpg?dl=1[/IMG]

I have a soldering iron, but its a relatively large old thing and I wouldn't trust it for any thing more precise than 2mm. I've only used it in the past for large speaker wiring and such. I'm thinking about ripping the wiring assembly off of the top of this old battery, and seeing if something in it is more accessible to my soldering. But I'm hesitant for two reasons. First, its quite bloated, and I worry about it exploding if I rip off the wrong part... Second, the battery still works for the most part, and its the only way I have of powering up the phone currently to make sure the phone still works.

Here are my resistance readings on the pinouts so far in Ohms:

A to E = 1 (Must be same pin, will refer as AE from here)

D to H = 1 (Must be same pin, will refer as DH from here)

AE to B = Nothing

AE to C = 595

AE to DH = 630

AE to F = 260

AE to G = Nothing

DH to B = Nothing

DH to C = 880

DH to F = 1012

DH to G = Nothing

B C F G = Nothing in any combination

I came across this site in my searches that may answer some questions if it is accurate. But its written in very bad English so I cant understand most of it. Here is the diagram from the site:

[IMG="S7pinout"]https://www.mobilerdx.com/wp-content/uploads/2018/03/Samsung-Galaxy-S7-G930F-Battery-Connector-Ways-Solution.jpg[/IMG]

The diagram seems to indicate my AE pins are ground, DH are +, C is the battery sensor, and F is something else. They mention BSI is very important, not sure what that is.

So my first few questions are:

1. Is this circuit board pinout accurate? Or is there a more official one available for this little battery port so I know what pin is what?

2. I've read some phones will shut off anyway under these methods unless a resistor is connected to one of the other pins besides + or -, once question 1 is answered, anyone know what resistance is required based on my readings, and what pin to connect?

3. Any advice on how to wire up the connector physically?

Thanks for reading, hope we can learn and figure some stuff out!