LEGO MINDSTORMS EV3 Lithium Ion Rechargeable Battery 7.4V 2200mAh DC (45501) | eBay
LEGO 9798 LEGO Mindstorms NXT Rechargeable Battery Set Parts Inventory and Instructions - LEGO Reference Guide
Sets that have x1678: Electric 7.4V Battery Rechargeable NXT
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Amazon.com: LEGO Mindstorms EV3 Rechargeable DC Battery (45501) : Toys & Games