Re: [Slightly OT] Laptop battery draining in Lenny

[Christian Jaeger]

2010/7/30 Mark :
> Unless I'm reading the ThinkWiki wrong Tp_smapi is not compatible with my
> machines...

Then I don't know, you'll have to find out about alternatives yourself
or hope someone else points them out, if they exist (I also guess not
all hardware allows to do that).

Ch.


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Re: [Slightly OT] Laptop battery draining in Lenny

[Lawrence Cadden]

On Fri, Jul 30, 2010 at 9:10 PM, Christian Jaeger  wrote:

> 2010/7/30 Mark :
> > Thank you Christian.  Correct, Li-ion is the discussion here.  So is
> there a
> > way to keep the battery in the laptop, without it charging to 100%?  Both
> > machines in this case are Dell's, one Inspiron and one XPS, both 5+ years
> > old.
>
> Yes, see the Tp_smapi link posted above (although I still haven't used
> it myself, because of lazyness and because a fully charged battery can
> be useful too :).
>
> Ch.
>
>
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>
>


Like when you unplug :)
O hi, been lurking for a while now.
New to linux, Debian Squeeze on the desktop, Jolicloud on the netbook.

Larry

Re: [Slightly OT] Laptop battery draining in Lenny

[Mark]

On Fri, Jul 30, 2010 at 6:10 PM, Christian Jaeger  wrote:

> 2010/7/30 Mark :
> > Thank you Christian.  Correct, Li-ion is the discussion here.  So is
> there a
> > way to keep the battery in the laptop, without it charging to 100%?  Both
> > machines in this case are Dell's, one Inspiron and one XPS, both 5+ years
> > old.
>
> Yes, see the Tp_smapi link posted above (although I still haven't used
> it myself, because of lazyness and because a fully charged battery can
> be useful too :).
>

Unless I'm reading the ThinkWiki wrong Tp_smapi is not compatible with my
machines...

Re: [Slightly OT] Laptop battery draining in Lenny

[Christian Jaeger]

2010/7/30 Mark :
> Thank you Christian.  Correct, Li-ion is the discussion here.  So is there a
> way to keep the battery in the laptop, without it charging to 100%?  Both
> machines in this case are Dell's, one Inspiron and one XPS, both 5+ years
> old.

Yes, see the Tp_smapi link posted above (although I still haven't used
it myself, because of lazyness and because a fully charged battery can
be useful too :).

Ch.


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Re: [Slightly OT] Laptop battery draining in Lenny

[Mark]

On Fri, Jul 30, 2010 at 5:08 PM, Christian Jaeger  wrote:

> 2010/7/30 Mark :
> > Or do you shutdown  when the battery
> > reaches, say, 5%?
> >
> > I just ordered a few laptop battery replacements
>
> I guess you're talking about Lithium ion or Lithium polymer batteries
> (as all modern devices are using either of those)? Then you do rather
> *not* want to deep discharge them often, or at least not leave them in
> this state for a long time. They are said to live longest when about
> half full. Unlike NiCd batteries they exhibit no memory effect, so
> there is no use for deep discharge except occasionally to let the
> electronic fuel gauge recalibrate itself so that the displayed charge
> percentage is correct. Aside keeping them half full and keeping them
> at cool temperatures, you can do nothing to prevent those batteries
> from loosing capacity over time, they age whatever you do.
>

Thank you Christian.  Correct, Li-ion is the discussion here.  So is there a
way to keep the battery in the laptop, without it charging to 100%?  Both
machines in this case are Dell's, one Inspiron and one XPS, both 5+ years
old.

Re: [Slightly OT] Laptop battery draining in Lenny

[Gilbert Sullivan]

On 07/30/2010 08:08 PM, Christian Jaeger wrote:

2010/7/30 Mark:

Or do you shutdown  when the battery
reaches, say, 5%?

I just ordered a few laptop battery replacements


I guess you're talking about Lithium ion or Lithium polymer batteries
(as all modern devices are using either of those)? Then you do rather
*not* want to deep discharge them often, or at least not leave them in
this state for a long time. They are said to live longest when about
half full. Unlike NiCd batteries they exhibit no memory effect, so
there is no use for deep discharge except occasionally to let the
electronic fuel gauge recalibrate itself so that the displayed charge
percentage is correct. Aside keeping them half full and keeping them
at cool temperatures, you can do nothing to prevent those batteries
from loosing capacity over time, they age whatever you do.


I was going to post exactly this opinion earlier in the day when a 
work-related issue interrupted me. I'm not going to claim engineering 
level expertise in this matter, but I've been using laptop / notebook 
computers as my primary systems since the time when they first became 
available. IIRC deep discharge cycling of these more recent batteries is 
not what you want to prolong their life-spans. That was the game we 
played with NiCad batteries to prevent them from developing "memory" 
issues which caused them to think they were low on charge when they were 
actually at 40-50% charge. The newer battery and battery charging 
circuit technologies have rendered that strategy obsolete, I think.



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Re: [Slightly OT] Laptop battery draining in Lenny

[Christian Jaeger]

2010/7/30 Mark :
> Or do you shutdown  when the battery
> reaches, say, 5%?
>
> I just ordered a few laptop battery replacements

I guess you're talking about Lithium ion or Lithium polymer batteries
(as all modern devices are using either of those)? Then you do rather
*not* want to deep discharge them often, or at least not leave them in
this state for a long time. They are said to live longest when about
half full. Unlike NiCd batteries they exhibit no memory effect, so
there is no use for deep discharge except occasionally to let the
electronic fuel gauge recalibrate itself so that the displayed charge
percentage is correct. Aside keeping them half full and keeping them
at cool temperatures, you can do nothing to prevent those batteries
from loosing capacity over time, they age whatever you do.

Ch.


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RE: [Slightly OT] Laptop battery draining in Lenny

[Mike Viau]

Date: Fri, 30 Jul 2010 11:24:52 -0700
Subject: [Slightly OT] Laptop battery draining in Lenny
From: mamar...@gmail.com
To: debian-user@lists.debian.org

I am curious how others on this list manage their laptop batteries while using 
Debian.  From doing some research, there doesn't appear to be many (if any) 
software solutions for draining a laptop battery completely, before recharging. 
 So what do people on this list do - just keep running Debian on battery power 
until the battery totally dies, which sometimes doesn't give you ample time to 
shut down properly?  Or do you shutdown  when the battery reaches, say, 5%?


I just ordered a few laptop battery replacements off ebay and would like to 
manage them better than the ones I inherited, which were mostly dead by the 
time I got them.

Thanks for any ideas.

Mark


I use Tp_smapi (if you have a thinkpad that is compatible).


 It is available at: http://www.thinkwiki.org/wiki/Tp_smapi 


Then I run a script like this to load the kernel modules on-demand:

modprobe tp_smapi
if [ $? -ne 0 ]; then
echo "Error loading tp_smapi"
fi
if [ $? -eq 0  ]; then
echo "Loaded tp_smapi"
fi

modprobe hdaps
if [ $? -ne 0 ]; then
echo "Error loading hdaps"
fi
if [ $? -eq 0 ]; then
echo "Loaded hdaps"
fi
if [ $? -eq 0 ]; then
echo "Loaded hdaps"
fi

sleep 1
echo "Setting up BAT0 charging thesholds"
echo 40 > /sys/devices/platform/smapi/BAT0/start_charge_thresh 
echo 70 > /sys/devices/platform/smapi/BAT0/stop_charge_thresh 


I would be interested in knowing if other similar kernel modules exist to set 
laptop battery charging thresh-holds whether they be vendor specific or generic.


-M 
  
_
Learn more ways to connect with your buddies now
http://go.microsoft.com/?linkid=9734388

Re: [Slightly OT] Laptop battery draining in Lenny

[Michael Iatrou]

When the date was Friday 30 of July 2010, Mark wrote:

> I am curious how others on this list manage their laptop batteries while
> using Debian.  From doing some research, there doesn't appear to be many
>  (if any) software solutions for draining a laptop battery completely,
>  before recharging.  So what do people on this list do - just keep
>  running Debian on battery power until the battery totally dies, which
>  sometimes doesn't give you ample time to shut down properly?  Or do you
>  shutdown  when the battery reaches, say, 5%?

Just use a resistor to fully discharge the battery.

Michael



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[Slightly OT] Laptop battery draining in Lenny

[Mark]

I am curious how others on this list manage their laptop batteries while
using Debian.  From doing some research, there doesn't appear to be many (if
any) software solutions for draining a laptop battery completely, before
recharging.  So what do people on this list do - just keep running Debian on
battery power until the battery totally dies, which sometimes doesn't give
you ample time to shut down properly?  Or do you shutdown  when the battery
reaches, say, 5%?

I just ordered a few laptop battery replacements off ebay and would like to
manage them better than the ones I inherited, which were mostly dead by the
time I got them.

Thanks for any ideas.

Mark