Milwaukee M12 Battery and Charger Starter Pack has REDLINK™ intelligence & has up to 2X more run time, 20% more power &p to 2X more recharges (Compared with other Lithium -Ion technologies and / or with previous MILWAUKEE® battery technology. Results dependant on voltage, tool and application.) Battery and Charger Starter Pack prevents user from damaging their cordless power tool investment in abusive situations Battery and Charger Starter Pack keeps battery in ideal temperature range to provide maximum life Battery and Charger Starter Pack ensures optimal charge and discharge for maximum life Battery and Charger Starter Pack prevents cell damage from over-discharge Battery and Charger Starter Pack has impact and vibration protective rubber, cell separator & integrated weld frame