Both the 512 and the 552 use "AA" batteries. The 511 uses "N" cells, and would recommend against one of them.
However, the 552 is much larger than the 512 and really is too big for sporting rifles. It's designed for use on Main Battle rifles by Armies around the world.
I have my 512 sitting on an all black Ruger 10-22 sporter, and it's just right size wize.
US Army Retired
NRA Benefactor Life Member