"Lucky Android is free and open"
The OS is free and open, sure. Look at CyanogenMod for example.
The problem is not the OS, but the hardware upon which it runs, and any closed source binary blobs required to make that hardward function correctly. Motorola have an unpleasant habit of using signed, ocked bootloaders for example. You can recompile your OS to your heart's content, but it won't be going on locked hardware without the approval of a Moto Veep.
My own tabletty thing can run all sorts of versions of Android, so long as I'm willing to put up with either the sound, or the 3g radio, or both, not working. Again, not an open source problem, but that of an industry which is pathologically closed, restricted and untrusting.
But anyway... 1 day battery life? Oh, suddenly I don't care about what might otherwise have been an interesting device. Its just another toy. Next, please.