Amazon.com: Functions Power Functions Battery Box Compatible with Lego 8881,MOC Brick Parts PF Building Blocks Toy Assembled Accessories : Toys & Games
LEGO Compatible Power Functions 9V Battery Box
LEGO Battery Box 4.5V 6 x 11 x 3.33 Type 3 for connectors without middle pin | Brick Owl - LEGO Marketplace
Amazon.com: TEESE 4pcs Technic-Motor Set with Motor-Remote-Control, Battery- Box, Compatible with Lego-Technic-Parts : Toys & Games