Charge up to four power cells using only a wall outlet or 12V power source, such as your car, with the Core Quad Power Pack. This power pack is made so that it's easy to swap out your depleted power cell with a charged cell. When the depleted cell is placed in the pack, its power cell auto balancing feature will balance the charge levels of the power cells. Made from strong and durable plastic, this power pack can charge up to four power cells at once and is compatible with all CORE products. Additional Features Compatible with all CORE products Can charge up to 4 power cells at once Only needs a 12V power source or wall outletAbout CORE Motion, Inc.An Acronym for Conductor Optimized Rotate Energy, CORE technology is made to replace the heavy wire wound motors used for years with an innovative, multi-layered printed circuit board (PCB). Capable of producing high torque rotary motion at high efficiencies and power densities, this technology gives you all the power you need in a lightweight, zero-emissions package. Founded by Matt Jore and Lincoln Jore, a father and son team, along with a talented group of engineers, CORE Motion, Inc. continues to make strides in technology and has most recently come out with a hybrid power cell which is capable of storing and delivering unprecedented amounts of power in very small packages while being environmentally clean.