Our Classic Battery Cube is the power source for your circuits. It has a positive and a negative terminal. When you turn on the power switch, it delivers approximately 3.7 - 4.2 volts DC to your circuit. If the LED on the top of the cube is flashing red, then you have caused a short circuit and should troubleshoot. It's rechargeable and comes with its own microUSB cable.

The Battery Cube is just one part of a circuit. Add a motor to make your creations move, an LED to light them up, and a switch to take control!

Fits your bricks! Works with all LEGO® and MegaBloks®-type construction bricks
Seamless circuit connectivity (no soldering)
Safety-tested & approved for ages 8+
Created by STEM teachers, tested by kids

Important safety information Handle Circuit Cubes with care. They contain sensitive electronic components, including batteries, and can be damaged or cause injury if dropped, burned, punctured, crushed, disassembled, or if exposed to excessive heat or liquids. Do not use damaged Circuit Cubes. Batteries Do not attempt to replace the batteries yourself. You may damage the batteries, which can overheat and cause injury. Battery Disposal The lithium-ion batteries in your Battery Circuit Cube should be recycled by Tenka Labs or an authorized service provider. For more information about Tenka Labs lithium-ion batteries, go to tenkalabs.com/batteries.