Let me give an elaborate response then! Majority of these companies are not into developing new technologies. I imagine almost all of the components are outsourced from other manufacturers who are developing the new technologies. I mean one of the company developed a 5 inch display with 1080p resolution. It was in the new few months ago and today we are seeing this display being used by multiple companies including
Sony and ZTE. They did not develop this display. They just used it in their products. Now, it is not like the companies behind the battery technologies are sitting idle. They are working on creating newer technologies. I keep reading about fuel cell being used to develop the next generation of batteries. They would arrive eventually in the market. But right now, the technologies which are proven and are available in mass quantity is what these companies have access to. So the only option they have is to fit a larger sized battery. Larger display devices have more space for a larger battery so they tend to give a longer battery backup. But the larger display also consume more power so the end result is not that spectacular. The other option is to have thicker devices which is the confusing part. All of these companies try to out-do one another with the claims of the thinnest
smartphone in the market and so on. I do not see the charm. If I can have a device 10mm thick instead of 8mm thick but has a larger battery, I had prefer it. But nope. We are reaching a stage where some of these models are just 6.5mm in thickness! Why did
Apple launched the
iPhone with a non-removable back? One of the core reasons is that it allowed them to fit a larger battery. And more and more companies are adopting the same method to try to fit the largest battery they can fit in the space they have. Looking at how many technologies these companies manage to fit in such a compact device, I think it is rather impressive that these devices can last for as long as they do already! I mean compare the size of the battery in older
Nokia phones and the batteries in current generation phones. The size is slightly larger but the capabilities you get from a modern smartphone is astonishing. And most of them are able to last you a complete day of moderate usage! Compare that to budget segment
laptops that mostly come with battery backup of 3-4 hours maximum.