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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