M18™ 4.0 AH Battery Milwaukee

Delivers up to 2x more run time, up to 20% more power and up to 2x more battery life compared with other Lithium-Ion technologies and/or with previous MILWAUKEE® battery technology (Results depend on tool and application)
REDLITHIUM™-ION protection with REDLINK™ digital overload protection to prevent users from damaging their cordless power tool investment in abusive situations
Individual cell monitoring ensures optimal charge and discharge for maximum life
Durable metal frame battery construction with shock responsive separators preventing pack failure from excessive vibrations or drops
Water protection routes water away from the electronics & out of the battery pack
Can be used in extreme temperatures down to -20 °C without compromising on runtime and battery life
On-board battery fuel gauge helps the user to maximise his battery run-time efficiency