Something interesting about Li-Ion battery.....
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As I'm sure most of you know, leaving your laptop plugged in and
charging with a full battery charge is harmful for the battery. I have
been trying to see if Fedora's power management tool has something built
in so that when the battery reaches full charge, it will then discharge
to lets say around 95% before beginning to charge again. Friends of
mine with the same laptop use such measures except they are running
windows. However, based on the fact I did not see any documentation
about this, and that my battery charge does not appear to fluctuate at
all once it becomes fully charged (according to the statistics), I'm
guessing no such thing exists in Fedora. Does anyone have any
information as to whether this safety feature exists in Fedora, or
whether some other measures exist instead? Basically I'm just wondering
if I need to periodically unplug my laptop to preserve the lifespan of
the battery, which would be annoying. Also if this is not a feature is
anyone working on developing something like this for Fedora?
--
Brad Longo
North Carolina State University
Aerospace Engineering/Applied Mathematics
Raleigh, NC, USA
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On Mon, 2009-02-16 at 19:02 -0500, brad longo wrote:
> As I'm sure most of you know, leaving your laptop plugged in and
> charging with a full battery charge is harmful for the battery. I have
> been trying to see if Fedora's power management tool has something built
> in so that when the battery reaches full charge, it will then discharge
> to lets say around 95% before beginning to charge again. Friends of
> mine with the same laptop use such measures except they are running
> windows. However, based on the fact I did not see any documentation
> about this, and that my battery charge does not appear to fluctuate at
> all once it becomes fully charged (according to the statistics), I'm
> guessing no such thing exists in Fedora. Does anyone have any
> information as to whether this safety feature exists in Fedora, or
> whether some other measures exist instead? Basically I'm just wondering
> if I need to periodically unplug my laptop to preserve the lifespan of
> the battery, which would be annoying. Also if this is not a feature is
> anyone working on developing something like this for Fedora?
>
Brad,
If I'm not mistaken, I think the charger for the laptop stops charging
the laptop's battery when it is full. There's no need for a software
solution, as the hardware takes care of it. For Li-Ion batteries, if
this didn't happen, they would explode.
________________________________________________________________________
Basil Mohamed Gohar
[email protected]
www.basilgohar.com
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On Mon, 2009-02-16 at 19:02 -0500, brad longo wrote:
> As I'm sure most of you know, leaving your laptop plugged in and
> charging with a full battery charge is harmful for the battery.
No, it isn't. Where did you get that idea?
It's very harmful if you're using a charger which doesn't figure out
when the battery's full and switch to trickle charge mode but just keeps
dumping full charge power in - you'll kill the battery in short order
and, if you're lucky, set stuff on fire too. However, I know of not a
single laptop ever shipped with such a dumb charger. All laptops have
smart chargers, which sense when the charge is complete. Leaving the
laptop plugged in while fully charged is a perfectly normal use case
that all manufacturers expect and design for.
--
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org
http://www.happyassassin.net
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On Mon, Feb 16, 2009 at 07:02:52PM -0500, brad longo wrote:
> As I'm sure most of you know, leaving your laptop plugged in and
> charging with a full battery charge is harmful for the battery. I have
> been trying to see if Fedora's power management tool has something built
> in so that when the battery reaches full charge, it will then discharge
> to lets say around 95% before beginning to charge again. Friends of
> mine with the same laptop use such measures except they are running
> windows. However, based on the fact I did not see any documentation
> about this, and that my battery charge does not appear to fluctuate at
> all once it becomes fully charged (according to the statistics), I'm
> guessing no such thing exists in Fedora. Does anyone have any
> information as to whether this safety feature exists in Fedora, or
> whether some other measures exist instead? Basically I'm just wondering
> if I need to periodically unplug my laptop to preserve the lifespan of
> the battery, which would be annoying. Also if this is not a feature is
> anyone working on developing something like this for Fedora?
Charging of the battery is generally under firmware rather than software
control. Laptops will typically stop charging at 100%, at which point
the battery will slowly self-discharge. When the battery hits some
threshold (typically somewhere between 95% and 97%) the firmware will
start charging again.
What you're talking about is presumably an interface to modify that
threshold. This is device specific. The tp_smapi driver (which is not in
the kernel for exceedingly dull reasons) allows this to be configured on
Thinkpads. I don't believe that we know how to on any other systems.
--
Matthew Garrett | [email protected]
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