[ltp] T4x Battery Conditons Survey

[Jiang Qian]

It really depend on what battery temperature you have. Do you keep 
your battery in the computer when you're on AC? Then presumably most 
the time your battery is in the very harmful condition of high charge 
high temperature. See this link
http://www.batteryuniversity.com/partone-19.htm
Take a look at the table near the center. Your battery temperature is 
likely to be between 20 and 30 C, so after a year of us when it's mostly 
100% charged, it will be between 80%-94% of charge. You're even at 
higher end(90%). Count yourself lucky.

So I doubt this is a leveno-ibm issue. It's just how battery work. To 
prolong your batter charge, take it out when on AC and store it on 40% 
of charge in some cool place. Or if you insist on using it when on AC, 
use SMAPI to inhibit charging to keep it at 40% charged when you're on 
AC.
http://thinkwiki.org/wiki/SMAPI_support_for_Linux
Jiang

On Fri, Dec 16, 2005 at 03:53:03PM +0800, Kelvin KAN wrote:
> Now nearly 1 yr, in 38 charging cycles, the battery capacity of my T42 
> has dropped from 4700mAh (designed) to 4200mAh (fully charged).   
> Projecting this degradation into next yr, it will be practically giving 
> me only 2-hr running by next X'mas.
> 
> To be honest, I've been using the battery with great care and have 
> removed the battery while running on AC.  And 38 charge cycles in 1 yr 
> does NOT seem too frequent.
> 
> How's yours?  Really an IBM (not Lenovo) quality issue?
> 
> Thanks,
> -
> kelvin.
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