In article , taz24taz24
@blueyonder.co.uk says...
They tend to be "high temperature" versions (gets warm in emergency
lighting luminaires) so separator design has to be good. Dendritic
crystal growth through separators is the usual failure mode of Nicd's


--
Keith Lewis

Is that a white powdery substance. Or I'm I just
thinking of corrosion that forms on the aluminium
casing sometimes.
taz.


FWIW, The white powder associated with (leaking/venting) NiCds is
usually potassium hydroxide, a rather caustic material. A chemical
"cousin" is soduim hydroxide (lye). Don't ingest or get in eyes,
needless to say...

Woody

Is that a white powdery substance. Or I'm I just
thinking of corrosion that forms on the aluminium
casing sometimes.
taz.


FWIW, The white powder associated with (leaking/venting) NiCds is
usually potassium hydroxide, a rather caustic material. A chemical
"cousin" is soduim hydroxide (lye). Don't ingest or get in eyes,
needless to say...

Woody

It did tend to sting the skin if it came into contact with it.
taz.

Woody wrote:


FWIW, The white powder associated with (leaking/venting) NiCds is
usually potassium hydroxide

That's actually a bit of a relief. I assumed it had a lot of cadmium in
it, and I'd rather a hydroxide burn than cadmium poisoning!

Andy.