Sophisticated electronics: Milwaukee Redlink Intelligence. Overload Protection - Prevents user from damaging their cordless power tool investment in abusive situations. Temperature Management System - Keeps battery in ideal temperature range to provide maximum life. Individual Cell Monitoring - Ensures optimal charge and discharge for maximum life. Discharge Protection - Prevents cell damage from over-discharge. Up to 2X more run time, 20% more power, Up to 2X more recharges. Compared with other Lithium -Ion technologies and / or with previous Milwaukee battery technology. Results dependant on voltage, tool and application. Integrated weld frame. Cell separator. Impact and vibration protective rubber.