Originally Posted by hezetation
Sorry that you all don't understand battery technology, this is common practice for a large number of devices but no one notices because only iPad gets this kind of scrutiny. Would u really want to wait 2 hours for that last like 3-5min of use time? Read my post above regarding batteries & charging.
With Apple it is about the user experience. Not the hard numbers. As computer users, a bunch of us are pretty good at agonizing over the numbers. Apple has been trying to get us to chill for some time. For example, regarding download speeds - where are the old indicators that used to show us bytes-per-second in our browser downloads. It's not that we don't want to know about this very important figure it's just that, as a group we focus on it. Apple removed it. Now we're a little dumber but happier.
It's not difficult to give a good indication of Quality of Service (QoS) in communications devices but, if we were to see the actual signal to noise data we would freak out (and be very unhappy) so Apple (perhaps at the behest of the cell companies) dumbs it down for us and then throws in an averaging delay that means the direct correlation to data throughput and what I hear in a voice call is lost.
Battery measurement is about how much time I have left to charge and how much time I have left to use my device. Those numbers are not easy to determine, even if the user is not changing the parameters by actually (OMG) using the device. The charge function is a decreasing exponential and (as has been pointed out) probably has a safety component at the top end of the charge to soften the damage to the battery. Measuring current (no pun intended) battery capacity is like trying to measure how much gas you have in your gas tank by using a pressure gauge in the gravity fuel feed line. It is least accurate at the extremes of its range so Apple throws in an inverse exponential to make it look more linear and then gives us a number between 1-100 as an indication (or max minutes divided by that 1-100 number if you prefer).
These measures are not exact, their performance is not particularly well shaped to give us an accurate picture of what is going on. They are just indicators that give us a feel for the devices we use. I've no problem with that and I certainly would not hold off on buying the amazing devices that Apple produces because some of the indicators are somewhat fuzzy.
But the reality is that Apple plays with these indicators to make us feel good about our devices and not necessarily to inform us about how our devices are actually performing *right now*. That approach works for most people but does not sit well with a few of the more compulsive of us.
ps I love my Macs, my iPhone, and my iPad. But I do so for good reason. They work. They do the job I require of them. They don't get in my way while they are doing that job. It is a small price to pay to not be able to monitor them at a level of accuracy that suits me (but, perhaps, would not suit most people).