A1: Yes and no. The iPod's case is not designed to be opened, so, in that respect, it's not what would generally be referred to as "user-replaceable".
If all of the devout Mac faithful here could just calm down for a minute, they might be able to grasp that this is the crux of the problem. Apple designed this thing, that operates on battery power, with a battery that has a limited lifespan, with a case that IS NOT MEANT TO BE OPENED! CAN it be opened? Sure. CAN you replace the battery yourself? Sure. Did Apple make it reasonably easy to do so? No.
How anyone can argue that that isn't a ridiculous design, and one that is irritating as all get out, is beyond me.
But those who question or criticize Macs around here are asking to be pounced upon by the fanatical Apple cultists, who attack all who dare to question the wisdom, the brilliance, and the "hipness" of Apple and Steve Jobs.
As the satirical "iProduct" flyer says, "I buy Apple products. It just makes me feel special."