🚀 go-pugleaf

In article <BzJFsH.4G4@zoo.toronto.edu>, henry@zoo.toronto.edu (Henry Spencer) writes:
> In article <1992Dec19.230112.8340@klic.rain.com> keithl@klic.rain.com (Keith Lofstrom) writes:
>>>The output-voltage curve of a NiCd is essentially flat from pretty nearly
>>>full charge to pretty nearly empty.
>>
>>There are many applications where knowing the charge on the battery is 
>>crucial....one could provide a third electrode on a battery, of some other
>>materials ... designed to indicate the balance of electrolytes in the cell...
> 
> ...the temperature and ... pressure of a NiCd rise sharply when overcharging 
> begins. Premium-market NiCd systems often use cells with temperature or pres-
> sure sensors built in.

Some fast-chargers for NiCd powered RC model racing cars first discharge the
NiCd batteries to minimize "memory" effects, then charge the batteries at about
2.5 A. The charger monitors the rise in voltage. After about two minutes, the
battery will approach its operating voltage. It will go up about 2 more volts 
in 20 minutes. When the voltage begins to drop, the charger will change to a
trickle charge, and the battery is ready to use. These batteries are usually in
the range of 7.2 volts and 1 to 2 AH.
___________________________________________________________________________
 /\  Jeff Delinck              internet: delinck@pa621a.inland.com
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