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Saft NiCad Batteries | 18 comments (18 topical, editorial)

Re: Saft NiCad Batteries (3.00 / 0) (#15)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Mon Apr 21st, 2008 at 11:45:23 AM MST
(User Info)

Joe;
I like your numbers. The C/10 or C/20 would give a good long term charge for what he's wanting to do.
Lead Acid batts are good. My main reason for sticking with NiCds are that they can be drained down to having only 20% of their total charge left and be able to recover without a noticeable damage. In fact , they work better when used in this fashion.

When building or designing for NiCds the best way would be to use the negative slope method. NiMh have this slope too, but not as easy to detect.

Cheers
Bruce S

[ Parent ]

Re: Saft NiCad Batteries (3.00 / 0) (#16)
by joestue on Mon Apr 21st, 2008 at 02:41:20 PM MST
(User Info)

I forgot about the 80% discharge part, thanks for catching that.

If you only discharge the first 40%, I bet you could get the efficiency up.
This doesn't apply to NIMH though, speaking of which why do they put these in hybrids?
they should use NiCds.

[ Parent ]

Re: Saft NiCad Batteries (3.00 / 0) (#17)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Tue Apr 22nd, 2008 at 03:26:47 PM MST
(User Info)

joestue
The main reason for them using the NiMh is the chemistry. They are way less dangerous. Cadnimum is a very bad thing, and MUST always be handled like the poison it is. Worse than lead paint!!
NiMh also loose their standing charge slower than NiCds do.
But possibly the more important reason is that they only last about 500 cycles before they start wearing out :-)
Lithimum is coming along just fine, once those have been around a bunch more years, they'll be better in the long run.
Price is what keeps them out of my reach.

Cheers
Bruce S

[ Parent ]

Saft NiCad Batteries | 18 comments (18 topical, 0 editorial)

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