Quote:
Originally Posted by Katsunami
The lifetime does depend on the device, though.
Let's say that for each year a battery loses 25% of the capacity it has remaining. (I'm just making these numbers up, but it illustrates the point.) Then you will get this use out of it:
Year 1: 100%;
Year 2: 100 * 0.75 = 75%
Year 3: 75 * 0.75 = 56%
Year 4: 56 * 0.75 = 42%
Year 5: 42 * 0.75 = 31%
A laptop battery that starts out with 6 hours of usage will have declined to a maximum of two hours of use after 5 years. While still usable, it can be a pain in the neck.
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But at some point a battery dies entirely. That's the issue here. It might be after 3 years; it might be after 7 years. But it will happen at some point.