cell resurrection

[jono83]

Hi i bought some orion intellect 4200's second hand and they seem dead and jus wandered if there is anyway to bring them back to life all but one of the cells voltage in the pack is below 0.9 volts and overall its about 1.3 v for the whole pack is there anything i can do or shall i jus get my money back for them ? any help is much appreciated . jono

[Chequered Flag Racing]

try what Legend did in post 4 in this thread (http://www.oople.com/forums/showthread.php?t=13390)

[jono83]

cheers by flashing do you mean jus passing 12v across each cell briefly like for a second or 2 ?

[Southwell]

Ive just done mine, retested with a multimeter and they are now charging :)

Literally tap it on and off, don't hold it on, thats it. Mine shot up from 0.0v to 1.3v.

Now i just have to get up the balls to do it on my 4200's without blowing my hand off :D

[jono83]

cheers will give it a try later hope they dont blow up in my face lol :o

[Southwell]

Yeah i looked away and closed my eyes :lol:

They've just charged up to 5100mah :D

[neiloliver]

This will work if there is a 'soft' short within the cell, this occurs when dendrites grow on one electrode, pierce the separator and short against the other electrode, effectively short circuiting the cell. Applying 12V at very high current through the soft short burns it away and the cell usually works again… The trouble is that it can sometimes locally melt the separator and makes the cell prone to further internal short circuits which could pose a safety risk

Do this at your own risk!

[Bungleaio]

The trouble is that it can sometimes locally melt the separator and makes the cell prone to further internal short circuits which could pose a safety risk

Do this at your own risk!


ANd they say Lipo's are dangerours!

[neiloliver]

All batteries can be made to be dangerous under the wrong conditions. :bored: