The LEGO® Technic™ Small Hub Battery is a rechargeable lithium-ion battery for use with the Technic Small Hub (45609). This 630 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 LEGO Technic Small Hub and LEGO Education SPIKE™ Essential Set (45345). 630 mAh lithium-ion battery for extended use between charges. In-situ charging via USB cable. Quick battery replacement. Included with the LEGO® Technic™ Small Hub (45609) and SPIKE™ Essential Set (45345).