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LEGO has a mysterious new rechargeable battery, what can be the product? - RacingBrick
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
What is Inside a Lego LiPo Battery ? Power Fonction - YouTube