Power management system is a device that controls the electrical system and electrical switchgear, further enhancing electricity by preventing blackouts and disturbances. The system also includes various solutions such as electrical SCADA, load forecasting, electrical monitoring and control system, event playback, and system automation. https://www.quora.com/Is-there-evidence-that-Apple-intentionally-made-their-power-management-system-on-older-devices-slow-and-unstable-to-encourage-people-to-buy-new-ones/answer/Coherent-Market-Insights-1?prompt_topic_bio=1