My very old, 3rd Generation iPod has been used so much lately, I couldn't stand the short battery life. I couldn't even make it halfway through my workday without charging it during lunch out in the vehicle. So I did some research and bought myself a new battery and replaced it myself! I bought the battery from Newer Technology after doing some price matching online.
The whole replacement process took me about 2 minutes! Sure beats sending it in or paying someone else to do it. With this new battery, my battery life is actually going to be longer than the OEM battery that Apple supplies with it.
I can do things like this, but can't lay bricks; go figure.