Alternative LEGO Rechargeable Battery Box (8878) – Green Gecko Workshop
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
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Amazon.com: LEGO Functions Power Functions Battery Box 8881 (1 Piece) : Toys & Games
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LEGO® Power Functions Rechargeable Battery Box 8878 | Other | Buy online at the Official LEGO® Shop US
1 Day Send!!!Building Blocks Motor Technic Power Function Battery Box IR Remote Receiver Light Compatible Lego Kids Toys | Lazada Singapore
Make a Tiny Battery for LEGO Power Functions : 4 Steps - Instructables