The LEGO® Technic™ Large Hub Battery is a rechargeable lithium-ion battery for use with the Technic Large Hub. This high-capacity, 2,000 mAh battery can be charged while fitted to the hub using a micro USB cable and can also be removed quickly and conveniently without the need for tools. This battery is included with the 45601 Technic Large Hub and LEGO Education 45678 SPIKE™ Prime Set. • High-capacity 2,000 mAh lithium-ion battery for extended use between charges. • In-situ charging via USB cable.