"The MILWAUKEE® M18™ REDLITHIUM™ XC5.0 Starter Kit delivers up to 2.5X more runtime, 20% more power and 2X more recharges than standard lithium-ion batteries. The lithium-ion battery pack features superior pack construction, electronics, and performance providing users more work per charge and more work over pack life than any battery on the market. The rechargeable battery also delivers users with 5.0 amp-hours of runtime. Each battery pack is durably built for heavy-duty use, runs cooler, and performs in climates below 0°F/-18°C. This protection routes water away from the electronics and out of the battery pack, extends the users' battery run-time and life by minimizing heat, and prevents pack failures from vibration or drops. Built-in REDLINK™ Intelligence protects the battery from overloads, while the discharge protection prevents cell damage. An integrated temperature management system and individual cell monitoring help to maximize battery life. The MILWAUKEE® M18™ 6½"" Circular Saw is designed to provide users with powerful lightweight cutting for a variety of applications including plumbing, electrical, framing, finishing, and carpentry. The cordless circular saw is a high-performance tool that delivers the most durability in a cordless saw. It has a powerful 3,500 RPM motor letting users quickly and easily cut through tough material such as LVL headers. A magnesium upper guard gives users best-in-class durability to protect the blade from drops."