Do NOT discharge your Lithium Ion battery!!! Discharging will cause reduced capacity and lifetime.
http://en.wikipedia.org/wiki/Lithium_ion
On book and song prices
I think e-books should have at least an 50% price reduction compared to paper versions. Otherwise, what is the point.
An $.99 for a song is bloody expensive IMHO. You pay about the same amount for a DRM encoded incompatible content as for a CD version.