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.