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Re: [OM] Motor Drive 2

Subject: Re: [OM] Motor Drive 2
From: HI100@xxxxxxx
Date: Sat, 29 Apr 2000 15:03:14 EDT
mike1964@xxxxxxxxx writes:

<< For  NiCad health, you should run down fully before recharging, as
 NiCads are susceptible to "memory" effect, >>

I don't want to start a debate about memory in NiCds but the type of Nickel 
Cadmium battery used in the winder is signiificantly different from the 
normal cylindrical batteries used by consumers (allthough it is the same as 
the cells in 9v style consumer batteries.) Since the "memory" effect is 
usually associated with electronic equipment that has a very high cut off 
voltager setting I would guess that the memory effect (if it exsists in these 
cells) may be less important for motor operation (works to lower endpoint 
voltage). The button cells used in the MD are completely dry (they have no 
electrolyte) and have considerably different characteristics from normal 
(wet) cylindrical cells. (For example they have much lower self discharge 
rate).  If they do suffer from "memory" significantly then even completely 
discharging them often has other undesireable effects due to cell mismatch. 
During the complete discharge of a >battery< the mismatch in cells causes the 
weakest cells to be reverse charged. This damages the cells quite quickly.
             The Olympus charger is also not very well designed and the 
battery should be pulled off the charger and not left on charge promptly 
after the prescribed charged  time or else the cells will degrade quickly 
from overcharge. The archives have good suggestions on using household 
security timers to prevent this.

             Regards,
             >>>Tim Hughes<<<

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