i tried all steps you mentioned yet still unable to read the data, in addition do i have to disassemble the battery to recharge it with the power supply? also what’s the proper voltage of recharge.
thanks
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What battery 
Yes
Mavic pro battery, used to see one LED flashing then tried reviving using CP board, couldn’t read with this message appears error: could not perform smbus read 0x00, now no LED at all
note: i haven’t disassemble the battery
Alright, a quick review of what I have done so far
Check the battery voltage : 11.24 v
Checked all cells voltage: 3.74 v
And yet I can’t get to read the Battery info 
What else could be wrong? 
Your patience is really appreciated
Did you get this figured out, I was having the same issue. Its seems my PC had the issue not the CP2112 board or my connections. There was an issue loading Device settings for (Device ID) were not migrated from previous OS installation due to partial or ambiguous device match. I tried updating my windows and that did not work. I got my daughters laptop and installed the software there and had no issue connecting. I followed the steps in the DJI battery killer software and now my battery is charging.
Thank you. You have saved me a fortune for a new Mavic Air 1 battery.
I started with just the 2112 module connected using the DJI Battery Killer app but it wouldn’t read. Added 9v, still no but 12v worked to clear all. Still wouldn’t charge, so opened the case and carefully applied 3v to each of the cell is turn for short bursts. Reconnected the 2112, ran Battery Killer and now have the battery accepting a charge.
Thanks again. (I am an Australian member)
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am really confused about what went wrong 
Post a screenshot of the software with a battery connected and what is displayed when you try to read the battery info
And a picture of the cp2112 connections
I did mate , yet the same issue , I even tried the connector before I decided to go for soldering
try another CP2112 or another battery to test
Tried another battery, I’ll order other one.
Really appreciate your support and patience
Hi Guys
Is there any DGI battery killer software for Macs for my DJI Mavic air . All i can see is window versions on the web.
Here is my story - I hope it helps someone.
Bought a CP2112 off of Ebay (bought 2 of them just in case one wouldn’t work as they were cheap) Bought some wires off Ebay too.
The CP2112 was not soldered and I just held the plastic wire connector and board together for contact.
I had to plug in the CP2112 board via USB into my computer and then reboot my computer for it to actually work - took some time and a bunch of cables to find out that was the solution.
I had 3 Mavic Air 1 batteries that were dead. The first one I was able to revive by hooking up the SCL, SDA, 1 ground cable + I also hooked up a + and - to a new 9 volt battery.
I used DJI Battery Killer ver0.4beta 26.09.2021 that I got from this site.
First battery unsealed and cleared in 10 seconds no issues. Charged right up - back to life.
The next 2 batteries I had to open up and connect a 1 amp trickle charger - this Youtube video showed me how - its awesome: Dji mavic air battery repair
I only connected the trickle charger to the battery for 80 seconds to achieve a total of 10.5 volts (from 4.33 volts).
I then put the batteries back together and connected the CP2112 with the 9 volt battery like before and was able to unseal and clear first try.
Good Luck, I hope this helped!!
Hi Sparky,
i have received another CP2112 and tried all over again, same thing can’t read BMS.
but what got me confused is that i have another battery working properly, connected to the CP2112 and yet the same can’t get to read BMS.
what am i missing here?
Hi All,
This has been a great topic to read through and the most helpful I have seen anywhere.
I will be honest and say that its the reason that I joined the forum but my anticipation of getting what I want to do done is driving me to actually get airbourne rather than just fix an issue.
So there is not much refernece to my issue as quite a few years ago I put my Phantom 3 away in the attic and there it has stayed.
4 batteries that have been used about 10 times were in storage. Oh NO !! lol
I have already had mixed results with connecting to the BMS and I have currently tried 2 batteries.
No success as yet to revive them and yes they could be well too far gone. But you gotta love a try lol
My current battery I cannot get voltage is 1 cell at all so I am trying to do that manually.
My initial question although I have a lot more is does anyone know the pinouts of the balance cable on a Phantom 3 battery.
I want to build a cable so that I can try and charge on a balance charger to see if I can get some volatge in all cells.
Everyone says that you need volatge in all cells to run BatteryKiller.
I have however managed to connect once with external power to the battery , Not since though.
I have a few different versions of the program but none with PF2 clear so it may be down to a bad program.
I have been trying to find out how the balance cable actually works. Does it just monitor voltage on each cell and allow more charge to a cell ?
Sorry thats another question so I will stick the original. Knowing the above may help though lol
I have 1.2 jst and 2.4 jst ready to go I just need to try and find the correct pinouts to build the cable.
Hopefully someone may have some old knowedge around these batteries.
The charge board is not as easy to work out as a Phantom 4 and above
Thanks
Hi Miles.
While i am no expert for battery recovery i have done a lot of reading.
What is the current volatages on your cells.
When you read info it will tell you the cell levels.
If they are too low then i belive the battery will not start to charge and you will probably find your bad flags will return.
You may have to manually charge the battery to get the charger to kick in.
Im sure someone will confirm this if thats the case.