Subj : Battery charger.
To   : JEAN PARROT
From : TOM WALKER
Date : Fri Jun 17 2005 07:32 am

JP> TW> Here is some good general Information on Charging NiCAD and NiMH
JP> TW> Batteries The differences are small but Important.

JP>        The whole article dumped to my printer, Tom. Very good and full of
JP>  nice information.


Particualrly note the Smal but Important differencesbetween the "Float
Voltages" for the two types of cells. Floating peohaps is the Biggest
destroyer of NiCad and NiMH battereis becuase of inadequate current
control and the resultant heating. This is particualrly true for
batteries left in the Charging Stand most of the Time.
The KEY is to have a fairly good "Regualted" Power Supply. The Curreent
control itself after that is Deceptavely Simple. You just put a
Resistor in series that will LIMIT the short circuit current of the
power supply to the Value you want, C/10, C/5 or the desired current.
This crude system basicly works becasue the internal Resistance of the
Batteries are very low as evidenced by their very high Short Circuit
Current capabilities.
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