GliderIreland - Ireland RC Forum - Flying Model forum in Ireland

Misceleanous => Misceleanous => Topic started by: DennisZ on May 20, 2010, 21:46:01 PM

Title: dead cell in a 4-cell pack
Post by: DennisZ on May 20, 2010, 21:46:01 PM

Hello there,

I just discovered that  my 1 year/2 flights old 4-cell Rhino Zippy 2350
got a dead cell :(
The cell #3 is completely flat, in fact it has about 0.4v negative(!) voltage.
The pack was absolutely fine November last, when I had it fully charged.
It was sitting in a box for the winter.

Trying now to charge it using balancing charger -the charger just ignores #3 .
I wonder if there is any future for this pack apart from going to the salty bath ?

Denis

Title: dead cell in a 4-cell pack
Post by: DennisZ on May 20, 2010, 22:07:05 PM

just got it charged - looks like a 3-cell pack with 0.5v lower voltage

Title: dead cell in a 4-cell pack
Post by: IceWind on May 20, 2010, 23:42:32 PM

I have one here the same.
It's 2200mah 3S - 1S dead...

I know that sometimes is possible to bring it back to life, giving few charge at a time to that cell only, but as usually with LiPo's it's a risky process and slow...
The idea is to bring it up to a higher voltage and then charge it normally.

Title: dead cell in a 4-cell pack
Post by: JohnPearson on May 22, 2010, 23:41:51 PM

Hi dennis check with Richard, He recovered a lipo pack for me that I considered dead last year, I am still using it today.