[Ti] Battery Not Charging...

Kynan Shook kshook at cae.wisc.edu
Fri Oct 7 16:11:57 PDT 2005


Do you mean that the percentages are decreasing linearly?  That's the  
whole idea!  Nobody cares if you're at 98% of the fully-charged  
voltage if you only have 25% of your runtime left.  (aside for those  
who don't know; one nice thing about Lithium Ion batteries is that  
they maintain a relatively constant voltage until they start getting  
towards the end of their capacity - not all battery chemistries are  
equal in this respect)

The percentage is intended to show the total power left in the  
battery.  When you charge it, you will notice that the rate of  
charging slows down significantly at 75 or 80%.  This is when it  
switches from the fast charge to the trickle charge; this prevents  
overheating or overcharging of the battery, either of which could  
make it explode.

So, you should expect the discharge curve to be linear, except when  
looking at raw data (such as voltage) in a special utility.

John <simplymail at ururk.com> writes:
> Got the new battery, running it through it's break in procedure. Is
> there a place to find the real charge/discharge cycle? Not the
> idealistic kind Apple has on it's website. I have X-Charge, and right
> now (92-74%) it's looking a little too linear.
followed by...
> Don't get me wrong - the battery lasted 4 hours (with airport, email,
> and the processor running at 100% converting RAW image files). It's
> just the discharge curve was disconcertingly linear (I was expecting
> closer to an exponential decay). Of course, perhaps on a log-log
> scale it would look that way, I don't think a linear "curve" would
> look exponential, though.



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