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 CADA) : Toys & Games
Amazon.com: Functions Power Functions Battery Box Compatible with Lego 8881,MOC Brick Parts PF Building Blocks Toy Assembled Accessories : Toys & Games
How do I save this battery pack? : r/lego
LEGO part bb0892c01 - White Electric 9V Battery Box Powered Up Bluetooth HUB with Light Bluish Gray Bottom at BrickScout
1960s LEGO battery box and light brick | Quest for Bricks