piclist 2008\07\01\195746a >
Thread: Batteries that have memory
www.piclist.com/techref/power/batterys.htm?key=batteries
face picon face BY : Jinx email (remove spam text)



> Just so I understand correctly for the 1000uf method. Could this be
> a cap of larger values, say as much as 3000uf?

I zapped these cells using 9000uF (PSU reservoir). The point is you
need an inrush of current to break the dendrites. A few 1000uF isn't
even close to the J capacity of a cell so there's no danger of the cell
voltage rising too high

> 1: Take the cap to a 12-15 VDC supply
> 2: Connect the cap "-" to the ground PSU terminal, and the "+" to the
> PSU 12-15 VDC terminal briefly, say 15 seconds

It won't take that long, couple of seconds maybe

> 3: Disconnect the cap from the PSU, and connect the cap to one cell
> of the battery pack observing polarity again. Leave connected say 15
> seconds

Half-a-second. You'll probably see a spark and the cap will be discharged

> 4: Repeat for each cell in the pack, and repeat 3 or 4 times per cell

Correct. I clip the cap to the multimeter probes. Easy to handle and you
can see what's going on with the cell. When a pack has reached a certain
stage, you've got nothing to lose. Caught early enough, cells can return
to their former glory. Left to deteriorate I think the dendrites must build
up. You can blast one, creating a charge path, but the others left hold the
cell back from optimum performance

<01e001c8dbd6$009554d0$89aafea9@ivp1> 7bit

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