I can't imagine having to deal with a smaller battery then the RAZR Maxx. I would actually settle for a thicker phone to gain additional battery strength. It is such a pleasure not having to worry about charging up before a given activity as your confident you've got extra power.
When I was using the OG Droid or Droid X i would generally have to plan a charge before heading our for extended periods of photography or video taking. On holiday or simply a walk around say Boston, I had to remain conscious of the battery.
Let's hope battery technology grows in proportion, or close to, our insatiable appetite to use our phones in ever increasing ways.
I truly believe sooner than later our phones with yet untapped, not yet dreamt of technologies, will be the hub of our digital worlds. Most likely in the form of ideas like Google's glasses. We will soon no longer as individuals, utilize clunky items like desktops or for that matter laptops. We will walk free and unencumbered by cords and be able to interact with the world around us in ways not yet thought of.
All of it requiring ever increasing amounts of juice. Battery power.