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LEGO has a mysterious new rechargeable battery, what can be the product? - RacingBrick
LEGO has a mysterious new rechargeable battery, what can be the product? - RacingBrick
BrickLink - Part bb0045c03 : LEGO Electric 4.5V Battery Box 6 x 11 x 3 1/3 Type III for 1-Prong & 2-Prong Connectors [Electric, Battery Box] - BrickLink Reference Catalog
LEGO® 4578042 - 4638959 - 6116239 87513c01
lego motor bricks Battery Box For LEGOING Technic Power Functions AAA Battery Box DIY Case 88000 Building Blocks Imaginative|Stacking Blocks| - AliExpress
How to modify your Lego Technic Battery Box. Save on Batteries! More Power! - YouTube