Hub 88009 | Powered UP | Buy online at the Official LEGO® Shop US
Power Functions wagon for small LEGO trains
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Battery Box 88015 | Powered UP | Buy online at the Official LEGO® Shop US
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Batteries and Battery packs
Electric 9V Battery Box Small Assembly : Part 4760c01 | BrickLink
Alternative LEGO Battery Box - AA Type – Green Gecko Workshop
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Amazon.com: LEGO Power Functions AAA Battery Box 88000 : Toys & Games