LEGO PART 2847c01 Battery Box, 9V 4 x 14 x 4 with Dark Gray Base [Complete Assembly] | Rebrickable - Build with LEGO
BrickLink - Part 4760c01pb01 : LEGO Electric 9V Battery Box Small with 'POLICE' and Black Stripes Pattern [Electric, Battery Box] - BrickLink Reference Catalog
Lego Part 54950c01 Electric 9V Battery Box 4 x 11 x 7 with Red Switch 4895 8287 | eBay