This is a disassembly video. This topic was addressed in the comments and the said: ". If you put the maxx battery in a ultra, it will automatically change the phone description in the settings menu of the phone to say droid maxx instead of droid ultra." How cool is that I'm thinking about giving it a try.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?