MC18 Spare Battery with PowerPrecision Plus (3500 mAh)- Only compatible with MC18.- Uses advanced state of health and state of charge information to improve device management.Information available:- Advanced state of Charge (shows the remaining battery power based on two factors: present charge and present real-time usage patterns of the device. - Advanced State of Health (highly accurate end-of-life prediction)- Dynamic usage patterns are constantly calculated, factoring in criteria such as the applications that are in use and scanning frequency).