[ltp] Re: discharge prediction on new battery chronically wrong. Whose to blame?

[Mark Stosberg]

On Sun, 6 Dec 2009 18:27:23 -0700
Christos Papadopoulos <christos@CS.ColoState.EDU> wrote:

> How long did it last before it signaled complete discharge?  Did it get
> anywhere near the OEM battery when new?

Thanks for the reply. I think in all cases, it was reporting that I
should have something like an hour of battery left. Of course, I'm
never expecting it when it happens, so I haven't always recently checked
the battery status. I bought the laptop new, so I don't know what the
OEM battery would do. Although, the OEM batteries claim something like
7 hours and this once only even claims something like 4, according to Linux. 

> Your problem sounds like the battery. This was a common failure mode
> for many of the third party batteries I bought. See if you can return
> it. My third party batteries lasted about a year at best, after that
> the battery would die in 30mins or so.

Thanks. Tonight I found the final straw that lead to returning it. the
battery is physically larger than OEM battery it doesn't snap into the dock!

The rubber pads on the battery were also very cheaply attached and both
came off the same day. 

Now here's the related question: It's been sometime since the X41 was
new, so if I buy an OEM battery that is "new", isn't it likely that I'm
getting a battery that was manufactured several years ago and has been
degrading on a shelf since then? 

     Mark

> Christos.
> 
> 
> On Sun, Dec 06, 2009 at 08:06:39PM -0500, Mark Stosberg wrote:
> > 
> > I recently purchased a replacement battery for my X41 tablet
> > 
> > ( I bought it here: http://www.cutratebatteries.com/IBM-ThinkPad-X41-Tablet-Batteries/IB43M9 
> >   The battery identifies itself as being made by "SANYO" )
> > 
> > I am using the battery with Ubuntu Karmic Koala, and since I bought it
> > (about 2 weeks), the system has never correctly estimated the discharge
> > time. The result has been that 4 times that the power has just suddenly
> > cut out while I was running on battery (of course anything I was working
> > on at the time was lost). 
> > 
> > I'm considering returning the battery, but is this definitely the
> > battery's fault, or is the OS responsible for failing to correctly
> > detect the remaining battery capacity?
> > 
> > Thanks!
> > 
> >     Mark
> > 
> > -- 
> > http://mark.stosberg.com/
> > 
> > 
> > 
> > -- 
> > The linux-thinkpad mailing list home page is at:
> > http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad


-- 
http://mark.stosberg.com/