ipod Nano battery life

My wife doesn't use hers daily, and it seems like if it sits for a week, it'll be completely dead.
I did verify that she is turning it off, and not simply pausing it.
Anyone else have this problem?

put it on charge when not using it. aka: charge reguarly. The battey only lasts like 27 or 30 hours while on.

Any reason why mine won't turn on after locking it? Seems it's charged. ???

Again, won't hold a charge when OFF.
I guess I'll try to get warranty service. It should be able to go a few days between being used without going completely dead.