The FCC pictures show the underside of the back cover, so basically it will appear in reverse - it threw me off initially as well.
As for the size difference, maybe the pictures are of the revised Nexus 4, as opposed to the 5?
Might explain for the (relitively) small battery.
Ah, good catch there.
In any case, the battery size is meager. Regardless of optimizations or a purported (yet dubious) claim that the 800 is more frugal than the 600.
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