The Milwaukee M18HB6 18V 6.0Ah Li-ion Cordless REDLITHIUM High Output Battery delivers long-lasting power for all your cordless tools. Designed to give maximum performance, this battery provides extended runtime so you can work longer without stopping. It is built with REDLITHIUM technology to protect against overloading, overheating, and over-discharging, ensuring your tools stay safe and run efficiently.