This guy is a moron who doesn't do the necessary research on the product he is about to review/compare. According to the written warning on the battery itself, the battery is NOT REMOVABLE. This is what it says, verbatim, right from my very own Droid 4 (just so we're clear):
WARNING: BATTERY IS NOT REMOVABLE. DO NOT ATTEMPT TO REMOVE.
There it is, in black and white. If you want to see it for yourself I've encountered a few pictures on the internet that clearly shows this label on the battery. It is my understanding that the only reason the back cover is removable is to access the 4G SIM card and SD card. Please, if anyone believes that this is not the case, respond to this post. I would like to have a definitive answer as well, as I have been hearing conflicting reports about this issue. I don't know though, if it says it's not removable, it's not removable...right???