[P1] FW: [P1] Prolonging Battery Life

[BG]

I have a correction, it appears the battery life is not as good as the 
computer thinks it is.

As I was running on the battery I did not even get an hour of power 
before it died.

So back to the drawer it goes.

oh well

BG

On Jun 25, 2004, at 2:19 PM, BG wrote:

> I have been following this post also i am always looking for more and 
> longer battery life.
>
> Anyway on to my tale.  I bought an ibook 500 dual USB back in Aug or 
> Sept  03.
> When I got it the battery would only last for 30 of 40 minutes.
> I tried everything I could think of to get more life out of it.(I.E. 
> cycling thru discharge and charge, leaving on charge for a couple of 
> days etc... tried some 3rd party battery software.....no luck.
>
> I figured it was just used up so I bought a new battery.
>
> I thought about rebuilding the old one with some new cells( i have 
> done this with NiCads for my duos. Anyway after taking it apart and 
> pricing cells decided not to, too expensive and complex.
> Put the battery in my desk and forgot about it (meant to recycle it 
> one of these days).
>
> So this post got me thinking about it. Pulled it out today and it was 
> dead. so I put in my iBook and let it charge. It took almost 4 hours 
> to reach full charge. But according to the battery monitor i have 3 
> hours of power in this baby. I am surprised and amazed.
>
> Anybody have any ideas as to why it is now a viable battery after 
> sitting for almost 9 months?
> Anyone have any thoughts or insight?
>
> Thanks
>
> BG
>
>
>
>
>
>
>
>
> On Jun 22, 2004, at 6:08 PM, KhooCK wrote:
>
>>
>> Hi everyone
>>
>> I have been reading this thread with lots of interest. It seems to go
>> against my experience and understanding of lithium ion batteries. I 
>> have
>> always kept my battery in the book and kept it charged up >95% 
>> whenever I
>> can, and I lose about 10-15% of the capacity per year.
>>
>> My understanding is that (contrary to what's been discussed) to 
>> maintain a
>> lithium battery in maximum longevity, you should charge frequently, 
>> and keep
>> it topped up. Overcharging does kill the battery but this is not a 
>> problem
>> with modern 'books because of their more sophisticated charging 
>> circuits.
>> Deep discharges cause more damage to capacity than small discharges.
>> Wikipedia has a succinct article on batteries
>>
>> http://en.wikipedia.org/wiki/LiIon
>>
>>  as does battery university
>>
>> http://www.batteryuniversity.com/parttwo-34.htm
>>
>> In summary
>> A) Every lithium battery degrades over time
>> B) Temperature is by far and away the largest cause accelerating this
>> degradation
>> C) If you are going to store a battery, take it down to 40% and pop 
>> it in
>> the fridge (NB one of the problems is how you keep this maintained at 
>> 40% as
>> the battery will lose charge continually); Apple actually recommends 
>> you
>> fully charge the batteries then pop it in a cool place
>> (http://docs.info.apple.com/article.html?artnum=10571)
>> D) Recalibration of the battery should be done periodically by using 
>> the
>> book until it goes to sleep, then recharge fully
>> (http://docs.info.apple.com/article.html?artnum=86284)
>> E) Frequent small recharging is less harmful than large recharges
>>
>> Rgds
>> Khoo
> **************************
> Brian G
> Personal Mail
> briang113 at pacbell.net
>
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Brian G
Personal Mail
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