8878, Power Functions Rechargeable Battery Box - 8878, NOT AUTHENTIC LEGO BUT THIRD-PART BRAND, Hobbies & Toys, Toys & Games on Carousell
Technical Series The Power function Battery Box for High-Tech Car motor Compatible with 8878 8880 8881 Parts MOC Building Blocks - AliExpress Toys & Hobbies
88000 AAA Battery Box - 8.4V - 7 Cell Modification - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums