Suprising long life of my iPod nano's battery - 6 years and still working

My iPod nano I bought nearly 6 years ago is still in use, without changing battery.
It was one in the third generation and looks fatter than ones in other generations.
I changed its cover twice and replaced headphones more than 5 times, but its main unit and battery has surprisingly long life.

When I bought it, I ordered Apple care protect plan too, afraid of running out of battery in its first 2 years.

This surprisingly long life of its battery is probably because it doesn't have any mechanical parts unlike hard disk players like iPod classic, or unlike players driving tapes or disks by motors.

By the way the battery of my old PC doesn't work any more. It hasn't been working for more than two or three years. I think one reason the battery has run out is the PC was always plugged in to AC power and excessively charged, which makes its battery life shorter. Writing this article, I've just come up with another reason. As well as electrical circuits like CPU and RAMs, typical PC has mechanical parts like hard drives and ventilation fans. If I didn't think about the long life of my iPod's battery, I might never come up with that idea.

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