The chemistry that can provide power from metals makes those metals degrade over time and there's not much we can do about it.
I'm sure you've noticed that you see a noticeable difference in how well a phone battery holds a charge after a year or so. If you keep a phone long enough, its battery may not even have enough charge to survive a whole day. Have you ever wondered why?
Batteries: How do they work?
Electricity isn't magical. In fact, it's a pretty boring subject for most of us and we only want it to be there when we need to use it. But to understand why your phone needs charged more now than it did when you first got it, you need to know a little bit about how a battery works. Don't worry, we're going to stick with the basics here.
Electricity, like any sort of energy, isn't a thing you can create. All the things we think of as "making" electricity are really only converting one form of energy into another, and a battery uses a chemical reaction (energy) to build an electrical charge that can be metered out over time. Different materials can be used to build this charge and they will produce different results. In our phones, we use lithium-based batteries because they provide a decent level of output for a reasonable cost.
The estimated life of a phone battery is just that — an estimate.
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