Well I did a stupid.

[Dan Robinson]

Measure between each red

Click to shrink...

Might be being daft, but are you saying put both probes across a red each?

Not using the negative?

Thought that would upset the meter.

Sorry I'm more used to AC voltage and volt free switching circuits.

 

[Sewdhull]

Yes the reds are on the positive of each cell.

So one red will be the pos of cell 1 4v with ref to 0v

The reds between cell 1 POS and cell 2 pos will be across cell 2.

The reds between cell 2 pos and cell 3 pos will across cell 3.

You can measure cell voltages in this manner.

Most of my packs have different colours for balance wires

 

[Dan Robinson]

Yeah just done it after using up some Google Fu.

One cell is totally dead.   Other two have a healthy voltage. 

Funny how the brain works.   I knew the voltages of the cells were added together.  I just didn't twig it would be cullmulative on the red wires on the balance plug.  Just the Deans.

Not going risk pushing a charge on it.

 

[Sewdhull]

If it's dead it's damaged, chuck it.

 

[Dan Robinson]

If it's dead it's damaged, chuck it.

Click to shrink...

Not before I blow the fucker up ?

 

[Sewdhull]

Clip the reds together and stand back, ot the deans 

 

[Rogerborg]

One cell is totally dead.   Other two have a healthy voltage. 

Click to shrink...

Then you can cut it out and use it as a 7.4V after a bit of resoldering.  I have one like that which works fine.

 

[Dan Robinson]

Then you can cut it out and use it as a 7.4V after a bit of resoldering.  I have one like that which works fine.

Click to shrink...

Where's the fun in that though ?

 

[Rogerborg]

Where's the fun in that though ?

Click to shrink...

Do it blindfolded.

 

[Egon_247]

"unexpected involuntary disassembly"....