From: John Ruschmeyer (jruschme_at_comcast.net)
Date: Sun May 11 2003 - 04:39:15 PDT
On Sunday, May 11, 2003, at 05:07 AM, Robert Benschop wrote:
> On Saturday, May 10, 2003, at 11:23 Europe/Amsterdam, Bograt wrote:
>> Does anyone know if Li-ion batteries suffer from the dreaded memory
>> effect? Also can they be used in the Newton (in a tray, not as a pack).
>> I know that Ni-Cd suffer from the memory effect, so only use Ni-MH as
>> these are supposed to be free from it.
>
> AFAIK anything after Ni-Cd hardly has a memory affect, still for the
> sake of the longevity of the cells it seems a good idea to run them to
> their end every now and then.
Actually, LI-ION cells do have a memory effect, but a somewhat different
one than NiCd or NiMh cells.
In the traditional memory effect, the cell appears to charge to full
capacity, but has little or no actual current (i.e., very short run
times). With a Li-ion cell, the battery just reaches a point where it
will no longer charge to full capacity, but will provide steady current
up to the level of the charge.
As for running a Li-ion cell down to nothing, there seems to be some
indications that this actually contributes to the effect described above.
<<<john>>>
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