images are CC BY-NC-SA 3.0
Description: The Battery Cubelet provides energy to power a construction. It contains two rechargeable batteries and a small power switch. The batteries are removed from the Cubelet for charging, so if you keep a few batteries around, you won't need to stop what you're doing to wait for batteries to charge. You can add as many Battery Cubelets to a robot as you like to keep big robots running at their best. You'll get best results when the Battery Cubelets are equally charged; if one has less charge, it will shut down until the higher-charge Battery Cubelets are at an equal level.
Each Battery Cubelet contains two Tenergy RCR123A 3.2V 750mAh LiFePO4 rechargeable batteries.
Cubelets are magnetic blocks that can be snapped together to make an endless variety of robots. You can build robots that drive around on a tabletop, respond to light, sound, and temperature, and have surprisingly lifelike behavior. But instead of programming that behavior, you snap the cubelets together and watch the behavior emerge like with a flock of birds or a swarm of bees.
Note: Cubelets require a special battery and charger. You will need to purchase the charger separately.