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)<br>REDLITHIUM™-ION protection with REDLINK™ digital overload protection to prevent users from damaging their cordless power tool investment in abusive situations<br>Individual cell monitoring ensures optimal charge and discharge for maximum life<br>Durable metal frame battery construction with shock responsive separators preventing pack failure from excessive vibrations or drops<br>Water protection routes water away from the electronics &amp; out of the battery pack<br>Can be used in extreme temperatures down to -20 °C without compromising on runtime and battery life<br>On-board battery fuel gauge helps the user to maximize his battery run-time efficiency<br>18V 5.0Ah Li-Ion Battery (M18 Series)