LED Lighting Kit - Red & Blue Blinking LEGO Studs with 2x3 Battery Brick – Brick Loot
Amazon.com: PANW OHV 5.0LV8 General Motors Engine Model Building Blocks Toy Set with Motor, MOC V8 Engine Model Kit Construction Toy, Compatible with Lego, 2106PCS : Building Blocks: Toys & Games
Make a Lego battery box with a Paper Clip - YouTube