we need the -A to +B voltage too which purush has not indicated.

I did saw it while being on Video Call with him.
Please check Reply #18

I was just working on the lipo, I soldered the pink wire thinking the PCB could have got damaged, but I removed the pink wire and before replacing different wire, I check the voltage and its the same, that shows the PCB is in good condition and no additional wire is required.

The little brown circle in the PCB, I dont have any idea, I noticed it when I opened the lipo.

Still no clue what could be the problem...

Purush you have to post the -A to +B voltage as per india hobby's picture.

Further please do post reverse polarity voltages of  each terminal combination including your dean. Which will identify and isolate the cell with the problem

You may also be surprised to know your multimeter might be having the glitch. Try with different multimeter too.

@purush
With 3 cells, no matter what the voltage of each, even if reversed, if the total shows zero, it has to mean a connection break. (Break could even be inside a cell)
I dont think you have posted any pic showing voltage of each cell so far.
Can you do that please?

Here is the video......

You have still not shown reverse polarity voltages of the two cells between which the problem exists after interchanging probes

Here is the pics with reverse polarity....

Cell A and B put together in reverse polarity where the problem exists is it showing 0 or -7.9V?

Obviously its a case of poor connection at the PCB, how it is making one way is bewildering. Just remove the PCB and add a new PCB. If you want can send you one free.

Sundaram: I have sent you a PM...

I removed all lipo cells separately and the PCB, while removing the cell A -ve lead was broken which I noticed, check the attached photo.

I checked the flow of the PCB, it look good I tested with multimeter. check the attached photo.

Question: I have a rhino 2630mah Tx battery with 1 cell dead. can I remove the working cell and connect with zippy 2200mah and make a 3cell battery

The Tx Cell is not going to work since it's a low C Rating cell.
The overall C Rating of such Battery will deteriorate a lot and it can not be used for flying, etc

However you can use it for any other less Amp starving DIY projects.

BTW, we do have Turnigy 2200mAh 20C DIY cells but it's costly:
http://www.ebay.in/itm/Turnigy-2200mAh-1S-20C-Lipoly-Single-Cell-/191040629775?pt=IN_Toys_Games_School_Stuff&hash=item2c7ae8ac0f

Doesn't sound like an appropriate investment since the damaged LiPo is already an year old.