Re: NiCd and NiMH charging (and Dewalt)



Tim Wescott wrote:

On Tue, 19 Feb 2008 13:08:51 -0800, Neil Kalo wrote:

Is there much difference in a circuit designed to charge NiMH versus
NiCD batteries? How does the circuit tell what is attached? In
particular Dewalt brought out a completely new range of NiMH/NiCd
chargers when they introduced NiMH batteries. Was there any real need to
do this?


Yes, they did. NiMH batteries are more touchy about charging than NiCd batteries. If you charge a NiCd battery using the optimal NiMH procedure you'll get a slightly less than optimal charge; do it the other way around and you'll get a damaged battery and possibly a fire.

I think this is an urban legend.

BTW, the Lacrosse BC700 battery charger does not distinguish NiCd and NiMH. It is a very good charger indeed.

http://www.discovergadgets.com/product.asp?itmky=492702


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
.

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