The M18™ REDLITHIUM™ XC5.0 Two Battery Pack 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 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. The rechargeable battery also offers users 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 battery's run-time and life by minimizing heat, and prevents pack failures from vibration or drops.