The Milwaukee M18 B REDLITHIUM-ION™ Slide Battery Packs are fitted with sophisticated electronics (REDLINK™ Intelligence) and overload protection which prevents the user from damaging their cordless power tool investment in abusive situations. It has a temperature Management System which keeps the battery in ideal temperature range to provide maximum life. With individual Cell Monitoring which ensures optimal charge and discharge for maximum life and discharge protection which prevents cell damage from over-discharge. They offer up to twice the run time, 20% more power and up to twice the recharges compared to other Lithium-Ion technologies and or with previous Milwaukee® battery technology. Results dependant on voltage, tool and application.