I just ordered my Axim x51v yesterday (woohoo). Today I am ordering the accesories.

I got an extended (2200) battery for my Axim and I made up my mind on the Sena case as I have used Sena before on another devices and really liked it. However, I am not sure if I want the extended battery one or not. So my questions are:
1) I have spent years with my PDA in my left pants pocket. I even kept the huge Palm IIIc in my left pocket way back when. So I am not adverse to carrying a large object there but would prefer not to be overly encumbered. Currently I am switching from a Palm Life Drive to the Axim (it broke). So I was wondering if using the extended battery is comfortable to carry day-to-day?
2) For owners of the extended Sena cases, if I put the Axim in there with the regular battery, does it swim around alot? Does the Axim with the regular battery even work/fit right in an extended case?
3) How long, in real world time (i.e. based on your experience), is the battery life difference between the regular and extended battery?
Thank you!