On Thu, 20 Dec 2001 14:50:01 +1000, Rob Studdert wrote:
> On 19 Dec 2001 at 20:38, Doug Franklin wrote:
>
> > In a controlled test several years ago, an acquaintance measured a
> > specific six-Sub-C 1600 mAh pack dead shorting a bit over 100A for less
> > than five seconds. The current delivered dropped off to zero over the
> > next thirty or so seconds as the internal structure self-destructed
> > from the heat and and the chemical system was depleted by the venting.
>
> :-)
>
> Keen, I just checked the specs for the 1600mAh AA NiMH cells that I use in all
> my gear, the shirt circuit current is 7.75A for 2 seconds max, the cells
> internal resistance when fully charged is 25 mOhm.
>
> see: http://users.skynet.be/bs137713/DATASHEET/pdf/VH1600AA.PDF
>
> AFAIK NiMH cells have a higher energy density than NiCd cells but NiCd have a
> far higher short circuit current in most cases. I believe that some aircraft
> use NiCd batteries for starting?
>
> In school we used to use charged AA NiCd cells to heat up the pocket clips on
> old Parker ball point pens before sending across the room via air <vbg>
> Cheers,
> Rob Studdert
> HURSTVILLE AUSTRALIA
> Tel +61-2-9554-4110
> UTC(GMT) +10 Hours
> [EMAIL PROTECTED]
> http://members.ozemail.com.au/~distudio/publications.html
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