[SATLUG] laptop batteries

Todd W. Bucy toddwbucy at grandecom.net
Thu Mar 26 22:49:01 CDT 2009


I couldn't tell by your post but if you are using lithium ion batteries
then you might want to read the following.  It is enlightening

http://www.batteryuniversity.com/parttwo-34.htm

Todd

On Thu, 2009-03-26 at 22:42 -0500, Samuel Leon wrote:
> Borries Demeler wrote:
> > I have a question about laptop batteries.
> > 
> > I have an inspiron 9400 (made by Dell), which is now a couple of years
> > old, but works beautifully. It has a dual-core 1.6 GHZ Intel chipset.
> > I have 2 batteries for it, which I always recharge fully after use and
> > take out of the machine and store when not in use. I never leave the
> > batteries in the laptop while the AC power is connected after they are
> > recharged for fear that I may decrease the battery's life.
> > 
> > My question is: Am I unnecessarily paranoid about overcharging the
> > batteries, and could I rely on the electronics to automatically shut
> > off charging when full in this newer laptop (running slackware 12.2)?
> > 
> > My experience with older laptops has been that batteries never lasted 2
> > years when left in the laptop all the time, but these are still pretty good,
> > and last about 1.5-2 hours, when they were new they lasted about 2.5 hours.
> > 
> > Is that because I take the batteries out when they are full, or
> > is that unnecessary? I notice that the KLaptop applet from KDE reduces
> > charging when it gets close to full, and then quits charging when 100%
> > full (I assume this is true because of the way the charging light first
> > comes on only sporadically and finally turns off completely when 100%
> > charging state has been reached).
> > 
> > Any insights on how to extend battery life on these types of laptops
> > would be most welcome!
> > 
> > Thanks,
> > -Borries
> 
> 
> http://www.batteryuniversity.com/
> 
> If I remember right the best way to deal with lith-ion is to store the 
> batteries at 40% charge.  Like when I take my laptop to school, once I 
> get home I plug the laptop in but pull the battery until I will need it 
> next time.  Then I will put it back in a few hours before I leave to let 
> it charge up.  But I rarely use my laptop.  It sits on top of my dresser 
> for months at a time.



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