The Milwaukee M18B54 M18 18v 5ah Red Lithium-Ion Battery 4pk, a testament to Milwaukees commitment to quality and reliability. Introducing the Milwaukee M18B54 M18 18v 5ah Red Lithium-Ion Battery 4pk, a testament to Milwaukees commitment to quality and reliability. This pack of four batteries is designed to deliver more work per charge than any other battery on the market, making it an ideal choice for both professional and DIY users.Each battery in the pack features superior construction, electronics, and performance. The advanced design protects the battery against harsh job-site environments, routing water away from the electronics and out of the battery pack. This design also minimizes heat and prevents pack failures from vibration or drops, extending the batterys run-time and life. The M18B54 is also designed to operate in extreme cold weather conditions, demonstrating its versatility and adaptability. Managed by Milwaukee exclusive REDLINK Intelligence, the battery features overload protection to prevent damage to your cordless power tools in heavy-duty situations, and discharge protection to prevent cell damage. These batteries are compatible with over 60 M18 cordless solutions, offering you a wide range of applications. The on-board fuel gauge displays the remaining run time, reducing downtime on the job. The Milwaukee M18B54 M18 18v 5ah Red Lithium-Ion Battery 4pk offers 2.5 times more run time, 20 more power, and twice the life of a standard 18V lithium battery. Its not just a battery pack its a promise of performance and durability. Purchase today and experience the difference of Milwaukees quality and reliability.