This super smart Lithium battery is equipped with a protection circuit module/board (PCM or PCB) that is the "heart" of the battery. This circuit board prevents the battery from being over charged, over drained, and over discharged. Alerts are sent to your iOS or Android device so you know that status of your battery. This makes our Lithium batteries smarter and safer. The technology helps avoid explosions, fire, and damage. Certified For Safety, Transportation, Household, and Commercial Use.