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LEGO has a mysterious new rechargeable battery, what can be the product? - RacingBrick
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)
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Engineers build rechargeable pack for LEGO Technic Control+
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