I'm probably being annoying now.
Here's a comparison of both Xperia and XOSP battery icons
There's a little difference between them as the XOSP one looks larger in the horizontal side but smaller in the vertical side and has a 54x25 size, while the Xperia one has a size of 55x28
(from 1280x720 screens, 1080p and above or 600p and below may be different).
Couldn't find a place to put this in, so it's on General Discussion.