Re: Battery Cycle Life/Cost - Real Word Wisdom

["Eric Chang" <walkabout179@email.com>]

This is not memory effect.  It is the mysterious "M" effect, whose results are
essentially the same as the memory effect.
Also, it is caused by nearly the same factors,
and to the casual observer is indistinguishable
from the memory effect.  Don't call it the
memory effect, since that infuriates some
people.

Instead, make sure that you are not
overcharging (cooking) your batteries during
those short (and frequent) charges.  "M" may
as well stand for mass balance, since there is
a limited amount of active material that you
can afford to lose.



-----Original Message-----
From: "M.C. Appleby" <appleman@aztec.asu.edu>
Date: Sun, 27 Jan 2002 09:45:14 -0700
To:  <ev@listproc.sjsu.edu>
Subject: Re: Battery Cycle Life/Cost - Real Word Wisdom


> Is my thinking incorrect that batteries consistantly discharged 20% (80% of
> their max charge remains) that are consistantly then recharged will dimisish
> in capacity?  Would a battery at 80% of full charge be damaged sitting one
> night?  Maybe this begs my question for my "coming along conversion" &
> battery education.   All I have been reading indicates lead has a strong
> battery memory for shallow charging and eventually these short
> discharge/charge cycles will kill a pack and/or render amp/hours to far
> below rated levels.  I believe I have planned a pack (T-105's) that will
> typically be discharged 60 - 70% on daily driving, but I felt that on a 5
> mile trip to the store and back I would not plan a recharge, but wait to get
> more miles the next day.  Your belief is my wait will damage lead batteries
> and I should hook up to charge.
> 


-- 

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