I get good battery life out of my bionic (15+ hours off a charger, with what seems to me like heavy usage), but I rarely have the chance to see it dip below about 50%.
It's kind of a force of habit from using my old iphone that I just plug it in wherever I am and don't worry about it. I have the car dock, too, which charges it crazy fast while I'm driving anywhere, and if I'm at home I just plug it into my living-room laptop. Plus if I'm out somewhere, it's virtually guaranteed that I'm going to find a micro usb charger somewhere because it's so universal for charging devices.
Went to a friend's house recently for a party and there were microusb cables everywhere! (Just like at my house, go figure!)
When my wife and I got our bionics we just bought four or so extra cables from amazon and plugged them in around the house (both bathrooms, kitchen, next to the couch, next to the bed, etc), so we never have to think twice about just plugging the phone in if it needs a charge.