[TriLUG] Thinkpad Battery Charging Thresholds
Joel James Adamson
adamsonj at email.unc.edu
Tue Feb 15 15:57:48 EST 2011
Sorry if this is too far off-topic, but I've found better laptop advice
on this list than anywhere else. I recently bought a Lenovo Thinkpad
X100e, with a Lithium-ion battery. I know that optimally the battery
should be between 30 % and 80 % of full charge, so I've tried a number
of methods. I did try installing tp_smapi, but it didn't seem to
work, and I have not been using it. I'm running Fedora 14 with the
After a while of just unplugging when I got near 80 %, the battery
remarkably stopped charging by itself. I mean that I could plug it in
and if it were below 30 %, it would charge up to near 80 % (79.7 % IIRC)
and stop charging. Also, if it was above 30 %, I could plug it in and
it wouldn't charge at all, but then if it dipped below 30 %, it would
charge as described above. Problem solved, right?
However, two weeks or so ago, I accidentally drained the battery, and
since then the old charging behavior (i.e. no charging thresholds) has
1. What did I do to get the desired behavior in the first place?
2. How can I get it back?
3. Is there anything else I can do?
Just to save you some time, this is *not* a dual-boot machine; I know
that Windows has features that will control this, or can get to it
through Thinkvantage in Windows.
Joel J. Adamson
University of North Carolina at Chapel Hill
FSF Member #8164
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