LEGO has a mysterious new rechargeable battery, what can be the product? - RacingBrick
LEGO Power Functions Battery Box with Beam Connectors (16511 / 58119) | Brick Owl - LEGO Marketplace
Batteries and Battery packs
LEGO Electric 9V Battery Box 4 x 14 x 4 with Dark Gray Base (2847) | Brick Owl - LEGO Marketplace
LEGO PART 84599 Battery Box, Power Functions, with Dark Bluish Gray Bottom [Rechargeable] | Rebrickable - Build with LEGO
1960s LEGO battery box and light brick | Quest for Bricks
Moc Building Block Technical Parts 1pcs Power Functions Battery Box Aa 4x11x7 Compatible With Lego For Boys Toy (16511) - Model Building Kits - AliExpress