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Unless someone in the forum can time travel, no one knows how good the battery life of the Apple Watch 2 will have.
 
No revolutionary battery technology will be available until Apple Watch 6.

You heard it here first, folks.

I could be wrong, though.

I should start a blog. I could link back to old posts when I made incorrect predictions and raise my view count.
 
Logically, i expect the battery life would be shortened, because there are too many independent functions as well as internet connection. Battery capacity is just physics. Bigger the size, higher the battery capacity.
 
Logically, i expect the battery life would be shortened, because there are too many independent functions as well as internet connection. Battery capacity is just physics. Bigger the size, higher the battery capacity.

Not just physics but also technology. A battery of a given size is always improving in capacity due to evolving technology.
 
like solar energy ?
Solar energy is a ways off. It's used on conventional quartz watches, but they draw a minuscule amount of power, and they don't have to put a full-color display where the solar panels go.

Battery chemistry can be called "technology", I suppose. Lithium-ion batteries are always being repackaged to fit different spaces, but I think their chemistry itself is reaching its limits.

System CPUs and software can also be made to manage power consumption more efficiently. This is more about battery life, not capacity, but the end result is similar. The fewer clock cycles, the better; and more computation that can be done with each cycle means even less power draw. A big help for battery life in the iPhone 5S was the 64-bit system, needing less power to run the same tasks than the previous 32-bit architecture required.
 
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