Make a Tiny Battery for LEGO Power Functions : 4 Steps - Instructables
1960s LEGO battery box and light brick | Quest for Bricks
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
Alternative LEGO Rechargeable Battery Box (8878) – Green Gecko Workshop
LEGO® Power Functions Rechargeable Battery Box 8878 | Other | Buy online at the Official LEGO® Shop US