Amazon.com: LEGO Mindstorms EV3 Rechargeable DC Battery (45501) : Toys & Games
Battery Box 88015 | Powered UP | Buy online at the Official LEGO® Shop US
6 Li-PO AA to be used in Ev3 Mindstorms - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Amazon.com: NIIZ Power Functions Motor Set Compatible with Lego, 8 Pieces Science and Technology Motor Power Function Kit, Including 3 Motors Power Pack Remote Control Battery Box Extension Cord Set