The Vintage LEGO Rechargeable Lithium Ion Battery Box Set 9798 with Toy Transformer is a 2016 LEGO set that includes a gray and black battery box with a toy transformer. Made of lithium ion polymer and plastic, this set is designed for ages 8 and up. The set features a rechargeable battery option, making it a convenient and sustainable power source for LEGO building toys. With its unique design and high-quality materials, this LEGO set is sure to provide hours of entertainment and creativity for kids.