On Saturday 07 Feb 2004 11:47 am, Bruce Mitchell wrote:
My Lombard also uses Li-on so that's what he was talking about.
Is there anyone else out there truly knowledgeable on this subject who can advise us correctly?
I've found the reference I was thinking of; it's
<http://www.buchmann.ca/Chap10-page6.asp>
Here's an excerpt:
The Li-ion batteries prefer a shallow discharge. Partial discharges produce less wear than a full discharge and the capacity loss per cycle is reduced. A periodic full discharge is not required because the lithium-based battery has no memory. A full cycle constitutes a discharge to 3V/cell. When specifying the number of cycles a lithium-based battery can endure, manufacturers commonly use an 80 percent depth of discharge. This method resembles a reasonably accurate field simulation. It also achieves a higher cycle count than doing full discharges.
The POSSIBLE reason for doing a deep discharge with LiON is to calibrate the battery charging circuitry. After repeated charge discharge cycles it can get confused about the full and discharged voltage for the battery. This can result in the equipment not using the full capacity of the battery. I would only consider deeply discharging it if there was a specific problem. Where available a utility like Apple Battery Reset is a much better approach.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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