[ltp] Power drainage on T21

Justin Nichomoff linux-thinkpad@www.bm-soft.com
Tue, 25 Jun 2002 13:27:02 -0500 (CDT)

I don't know.  A fast battery drain is usually a sign of a
bad/old/damaged/etc battery.  However, I have noticed a clear difference
in battery life between win and lin running on my T20.  I get at least 30
minutes more in win, and that usually includes a higher level of precessor
use as well.

On Tue, 25 Jun 2002, Eric Jorgensen wrote:

> On Tue, 25 Jun 2002 12:24:05 +0200 (MEST)
> ZeiMoT <zeimot@astrakan.hig.se> wrote:
> > On 25 Jun 2002, Andrew McMillan wrote:
> > > Not sure abou that.  I only ever boot when I am on AC power to try and
> > > limit the side-effects of speed changing (last booted on 23rd May) and I
> > 
> > What are the sideeffects of speed changing ?
> > 
> > On my R30 I get 1.5hrs of time when it's running with the most powersaving
> > options set, and no harddrive reads, all I did was to write some documents
> > in emacs (no save during the testing time). All seems to work well the
> > first hour and 20 minutes, the battery led was green. apm reported that
> > there was 44% left in the battery. Then, almost like someone chopped the
> > head of my battery, it dropped to 4% and broadcasted that it now was time
> > to save my work... So I did, and the battery led changed from green to
> > orange at 1hr 28 minutes. For fun I manually shut down my computer so I
> > got everything unmounted correctly without shutting down with the apm, and
> > waited. at 1hr 33 minutes the led began to flash in orange an half a
> > minute later the battery was completely drained.
> > This battery is new and the specifications tell me it is supposed to last
> > for 2 hrs. Is that 2hrs without any hardrive access and with maximum power
> > savings ? Well, either case it does not last for 2hrs.
> > Do you get the same feeling as I get? That the battery is not feeling
> > well, a mistake maybe in the making process?
> 	That really sounds to me like a damaged battery pack. 
> 	I used to have a Toshiba notebook, and the battery it initially came with,
> initially would last me about 3 hours. After a year or so, it would take about
> 1.5 hours to drain to 50% or so, and then it would drop to 5% after about 5 more
> minutes. I bought another battery, which didn't do this. My guess is, some of
> the cells in the old pack are damaged, or just worn out, since these are lithium
> cells we're talking about I figure damage is more likely. (NiMH cells, in the
> bad old days, that would just be from age) 
> 	Maybe your battery is defective? damaged in shipping? I guess you'd have to
> diagnose the same problem in windows before you could satisfy IBM support to the
> extent that they'd replace it under warranty, possibly. 
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