The Power Subsystem is one of the most important Subsystem of the CubeSat. The Power Subsystem is responsible for ensuring the power needs of the CubeSat are met. This includes anything such as, regulating power, generating power during peaks when sunlight is at its greatest or at its lowers. A typical Power subsystem consists of solar panels, power distribution, and power management. The power source of CubeSats are typically lithium ion batteries due to them being lightweight, rechargeable, and small. Increased life expectancy is also another pro about using lithium ion batteries compared to typical double A's.