Try better battery stats or cpu watch dog to see what's causing that. Android system usage like that is an app acting up - wake locking your phone in this case. It has nothing to do with ICS specifically.
It's not a chip in the battery, just an antenna. Any batteries with it should be marked as such. Seeing as how there aren't any yet, we'll just have to wait and see if aftermarket manufacturers make them. Given nfc's new functions in ics, I'm betting they will.
If you have an LTE model, nope.
If you have a 3G, I don't know why you'd be referencing a sim, but instructions are here: http://forum.xda-developers.com/showthread.php?t=1016158
Link fail. I know the comic though. That's a good one.
And Mueller is a well-known shill. Read his articles knowing he has a bias, and conclude accordingly.
That quoted document is about the Nexus line, and the analysis provided in the article is horrendous, and just wrong. For a logical rebuttal, see here: http://techcrunch.com/2011/09/07/the-bombshell-that-wasnt-foss-patents-android-scoop-misses-the-mark/
The one you circled in pink is just a small version of the blown up graph.
As far as signal goes, green is the strongest. I think then it's yellow. Then gray. Then red. This is important because the weaker the signal, the worse your battery life will be.
I guess I should have said throughput. I thought it went without saying that the class doesn't affect access time.
And 300 images is a pretty miniscule number. It's not surprising you've seen no problems.