Re: NiCd and NiMH charging (and Dewalt)
- From: James Beck <jim@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 20 Feb 2008 10:26:32 -0500
In article <aKmdnZscNNKz4ybanZ2dnUVZ_gOdnZ2d@xxxxxxxxxxxx>,
tim@xxxxxxxxxxxxxxxx says...
Vladimir Vassilevsky wrote:Well, I can tell you from experience that (depending on how aggressive
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
(shrug)
It may be an urban legend, but it was splattered all over the design
rags, with endorsement and encouragement from the NiMH battery
manufacturers, when NiMH batteries were first coming out.
As I stated in my post, there's no reason that you couldn't make a
battery charger that would do fine with both types, but a peak charger
for a NiCd wouldn't necessarily work well for a NiMH. It looks like
Lacrosse did just that.
I don't have a gross of each type of batteries, or the will, to pull out
an old NiCd charger and prove it one way or another.
the charger is) setting a universal quick charger to NiCD and plugging
in NiMH can sure pop them. I have a charger that you can select the
delta V in 4 different ranges. 2 for NiCD and 2 for NiMH. I had it set
for the wrong cell and popped off an 8 cell 2700mAH A size NiMH pack. I
think what really happened was the cells got hot enough to destroy the
individual cell covering and the cells just shorted together and off it
went, but that's just my best guess because the unit was destroyed and
there were flying cell cans going everywhere.
Jim
.
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