Why can't ipod make a cheap replacement battery such are on mobile phones? I have a Sony Ericsson w800i walkman phone which plays for 8-10 hours with EQ on and the volume at max. After a year and a half, I replaced the battery. It cost me 5 eur. I don't see the battery on a Nano being more superior therefore I don't see a reason for it to be far more expensive. Thoughts?