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Compatible with 8878 Power Functions Rechargeable Battery Box 800mAh | eBay
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LEGO® Technic™ Small Hub Battery 45612 | LEGO® Education | Buy online at the Official LEGO® Shop US
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Lego Power Functions AAA BATTERY BOX (technic,remote,compressor,motor,train) | eBay
Amazon.com: DooQi CADA Technik Power Function Kit for Technical Cars, Including 3 Motors, LEDs, Battery Box and 2.4 Ghz Remote Control (Compatible with Many Models Such As Lego CADA) (S059-001) : Toys