It has been no surprise that many of Apple's critics and followers alike have been skeptical about one aspect of the Apple Watch in particular, its battery life. All the smartwatches out there have an unanimous theme to this conundrum. You cannot have a less than 2" square/rectangular screen that displays vivid colors and have a battery life of more than a day or so without it being housed in a huge brick like enclosure. Or in other words until we figure out a way to travel faster than the speed of light, we have laws of physics to abide by, in this world! But unfortunately this question remains unanswered even after the Apple announcement last week as Tim Cook only vaguely suggested a less than a day battery life for the Apple Watch .
Pebble watch has the best battery life as of now, of around a week. Now now, how can Pebble have almost seven days worth of battery life on a watch that has similar dimensions as the Apple Watch? The answer is simple, Pebble uses a black and white, e-paper display that consumes way less energy than a LCD, that other smartphones and smartwatches, like the iPhone and the Apple Watch use. So if you need a smartwatch that displays more than two colors, then you are going to have to charge it more often. Most of the Android Wear smartwatches, like the Moto 360, have the same problem too. Of course, I don't like another device in my house (other than my iPhone, my MacBook Pro, my iPad and my work laptop), to charge, but the reality is that battery technology has not evolved as well/fast as consumer technlogy (heck we still can't travel more than fifty odd miles with our Nissan Leaves, can we..) so far.
So for Tim Cook to not to reveal the exact battery life of the Apple Watch months before it will actually reach the customers is only understandable. Also Apple's battery life numbers are almost always accurate and in fact most of the real world battery life of its products far exceed the official number Apple provides. So for Apple to officially declare that the Apple Watch's battery life is so and so they need a respectable number of hours. Also remember when Intel released its extremely power smart processors last year, the Haswell processors? Apple's MacBook Airs blew their Windows counterpart by almost 2X more battery life for comparable hardware specs. The reason as I mentioned at that time, is the tight integration of Apple's hardware and software or how well the software optimizes the hardware's performance. Hence Apple could still well be in the process of optimizing the Apple Watch's battery life by tweaking its software. So attribute it to any of the above mentioned reasons, Apple Watch's battery life is going to be less than a day and I would rally be surprised if it ends up being more than 24 hours at best.
However much us Apple fanatics would like to see Apple create magical devices out there, Apple cannot turn in miracles. The Apple Watch as it is, is being criticized of being too bulky (though most of the people who actually go to use it in person have changed their minds) and there is no way for Apple to make a Watch that does as much as what a smartwatch is expected to do and make is thin and on top of that make its battery last for days. I wish all this would happen though!