I've done over a dozen cells so far. These have been sitting around for 5-10 
yrs, some Nicd, some NimH. As low as 0.1v to start. I was using a Maha MH-C777+ 
and it wouldn't even detect polarity they were so bad. So far the worst result 
has been 90% of the rated mAh written on the cell after one cycle. Most have 
come out better. The best results are with the ~40 hour 'break in' cycle. It 
does 0.1C for 16 hours, then discharge, then another 0.1C charge.

You can also set manual charge and discharge rates as well as number of cycles 
and just let 'er rip. It will remember the stats on the final 12 cycles for you 
  afterward. It uses the usual delta V and delta T methods.

There will probably be ones it won't bring back, but I've got a whole shelf of 
very old ones that it seems to be working wonders for. I would discharge (it 
has a discharge-only cycle too) any failures and run the cycle a few more times 
though before giving up.

With it, I can even set a discharge rate and see how much I get out of it for 
high current applications ahead of time, saving some pain when going to use 
some of these with hidden problems developing inside. ;)

-Skip

John Gardner wrote:

> I'm interested in your experiences - I've had good luck so far with keeping
> NiMH cells within 10% of capacity - Most are long in the tooth cells I've
> paired up using data from the charger.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist