The LEGO® Technic™ Small Hub Battery is an essential accessory for those using the Technic Small Hub (45609) or LEGO Education SPIKE™ Essential Set (45345). This 630 mAh lithium-ion battery provides extended use between charges and can be conveniently charged in-situ using a micro USB cable. The battery can also be quickly and easily removed without tools, allowing for seamless swapping and continued play. Combine this battery with the Small Hub and SPIKE™ Essential Set for a complete Technic building experience.