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 minus 18 degrees 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, preventing users from damaging their cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage.