The Milwaukee-48-11-1850 M18 Redlithium XC 5.0AH Extended Capacity Battery Pack is a high-performance battery pack designed for handheld power drills. With its superior pack construction and advanced electronics, this lithium-ion battery delivers up to 2.5 times more run-time, 20% more power, and has a lifespan that is twice as long as standard lithium-ion batteries. It provides more work per charge and more work over the life of the pack, making it the ideal choice for professionals and DIY enthusiasts alike. With a voltage of 18V and a capacity of 5.0Ah, this extended capacity battery pack ensures long-lasting power for your power drill.