[Noisebridge-discuss] lithium-ion battery questions

[Gian Pablo Villamil]

If you are using Windows, the Lenovo battery management utilities are  
pretty decent, and will prompt you through the calibration process.



On Dec 19, 2009, at 8:42 PM, David Yao <kudegra+nb at gmail.com> wrote:

> I think the sales person was speaking in term of using it in the  
> laptop until the laptop does its own safe shutdown, which is a safe  
> discharge for li-ion batteries. The computer ought to follow the  
> norms for protecting the battery in this case. I presume damage  
> doesnt occur until the battery is discharged beyond this OS shutdown  
> point. Thus you should be fine if you start charging soon after OS  
> deems it time to shutdown.
>
> A possible reason for his recommendation to cycle the battery like  
> this is that the OS/BIOS could need to re-calibrate with the new  
> battery. Going straight from and old, worn out battery, to a fresh  
> new battery can make the laptop's time-remaining estimation  
> inaccurate. ie, laptops supposedly re-calibrate the time-remaining  
> with every charge-discharge cycle, and so the calibration for an old  
> battery can be vastly different than what it should be for a new  
> battery. Doing a full charge-discharge cycle a few times ought to re- 
> calibrate it.
>
> That's my guess.
>
> -
> DYao
>
>
> On Sat, Dec 19, 2009 at 8:28 PM, Michael Shiloh <michaelshiloh1010 at gmail.com 
> > wrote:
> I little suspicious advice. I think discharging completely is very bad
> for Li batteries, so much so that they usually have a built in circuit
> that cuts out at some threshold.
>
> If no one on this list is an expert, I can forward your question to a
> friend who is quite an expert.
>
> M
>
> John Magolske wrote:
> > I recently bought a replacement lithium-ion battery for my X40
> > ThinkPad. The salesperson at Central Computers mentioned I should
> > charge it to 100% and completely discharge it, cycling twice in this
> > manner as an initial "breaking in" procedure. Would anyone know if
> > this is appropriate for a lithium-ion battery? Battery University  
> [1]
> > recommends against discharging lithium-based batteries too deeply.
> >
> > Also, there are safety issues with lithium-ion batteries [2], so  
> I'm a
> > little concerned that I might be taking more of a risk by  
> purchasing a
> > "no-name" replacement rather than the official Lenova branded  
> battery.
> >
> > [1] http://www.batteryuniversity.com/parttwo-36.htm
> > [2] http://www.batteryuniversity.com/partone-5B.htm
> >
> > TIA for any perspective on this,
> >
> > John
> >
> >
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