I don't have an extended battery but I have noticed a couple of things in what people are reporting ...
The battery statistics can be "off" after you fo the 5.5.893 OTA upgrade until you do the soft reset (holding down volume up/volume down/power).
If you are in an area wihout 4G and have 4G enabled it will constantly search trying to connect and suck the battery down. In this case ... disable 4G.
A lot of people are reporting that they disable 4G and only enable it when they know they have a defintite need for it when they are downloading a lot of data.
(There is an accumulation of nifty tips at ...
http://androidforums.com/motorola-droid-bionic/421050-post-your-tips-bionic-here.html.)
... Thom