A power charge controller is a device used to regulate the flow of electricity from a power source to a battery. Some common synonyms for power charge controller include solar charge controller, battery charge controller, and charge regulator. These devices are necessary for proper charging and maintenance of batteries in solar power systems, vehicles, and other electronic devices. Other related synonyms include voltage regulator, current regulator, and battery management system. Regardless of the term used, they all serve the same function of regulating and protecting batteries from overcharging or excessive discharge, which can significantly reduce the lifespan of the battery.