Milwaukee M18B5 5Ah 18V Power Tool Battery, For Use With M18 Series

Delivers up to 2.5x 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 Milwaukee® 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 maximize his battery run-time efficiency.