LEGO part 87513c01 - Light Bluish Gray Electric 9V Battery Box Power Functions (Non-Rechargeable) with Dark Bluish Gray Bottom at BrickScout
Bricker - Part LEGO - bb0045c03 Electric 4.5V Battery Box 6 x 11 x 3 1/3 Type III for 1-Prong & 2-Prong Connectors
Amazon.com: DooQi CADA Technik Power Function Kit for Technical Cars, Including 3 Motors, LEDs, Battery Box and 2.4 Ghz Remote Control (Compatible with Many Models Such As Lego CADA) (S059-001) : Toys
LEGO Battery Box 4.5V 6 x 11 x 3.33 Type 3 for connectors without middle pin | Brick Owl - LEGO Marketplace
Amazon.com: LEGO Power Functions AAA Battery Box 88000 : Toys & Games