On 11/10/11 18:02, Martin N wrote:
Lo,
At 21:20 10/11/2011, you wrote:
On 11/10/11 11:02, Martin N wrote:
Hello,
A couple of second hand T60 Thinkpad batteries have come up on ebay
and i was wondering
if anybody on here had an idea roughly what sort of time i could
expect from the second
batteries.
First is described as tested 91% from the IBM battery management
software.
Second one is 98%
They are both the 9 cell physically larger battery pack.
Thanks for your time
Martin N
Running MorphOS v2.6 (Nov 2010) on Mac Mini, Moderator of
MiniDisc,amithlonopen,bwfc Yahoogroups
I would not get them. You simply can't know what the real health of a
battery is by looking at the charge rate. If I had a choice between
used
real IBM batteries and a new clone battery, I'd take the clone.
Of course, it's a roulette game. I know someone who saw some batteries
for his X6x laptop, and got three used ones for $40 and they all worked!
But I've bought things like that where it would have been more
entertaining
to stand in the flea market burning $20 bills...
So you are also saying that charge capacity is no indicator of battery
life?
Martin N
Running MorphOS v2.6 (Nov 2010) on Mac Mini, Moderator of
MiniDisc,amithlonopen,bwfc Yahoogroups
It's not that the charge capacity isn't an indicator of life, but that
it isn't indicative
of it's future health. Sometimes, you get a battery whose life
degrades. I'm on my
second battery on my W500, and its definitely a slope, watching the
capacity go down.
I've lost about 35% in a year so. The first one did the same thing,
too. That's the
good form of battery decay--you can watch it and plan accordingly. Then
there is
the more dramatic situation where a single cell fails inside, making the
battery 8/9ths
good, which isn't very good for the battery at all. A lower resistance
of a cell makes
charging weird, either making the damaged cell get really hot as the
others take
on power, or a blown open cell where charging doesn't do much at all.
Then there
is the problem of the charge counter circuit going bad, which I saw once
and worked
on with a friend, bypassing it completely and had a good battery for
about a year
after that.
Laptops ask an awful lot from batteries today. I dare say none of my
ham stuff
sucks current out of them the way a laptop does. We really don't yet
have a good
technology for batteries--not really. Yes, better than the old NiCd,
but still finicky.
--STeve Andre'
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