The XC5.0 extended capacity battery provides optimized performance and overload protection using total system communication between tool, battery and charger. Durable and long lasting performance. Fuel gauge onboard displays remaining runtime for less downtime on the job. Advanced design to protect the pack against harsh jobsite environments. This protection routes water away from the electronics and out of the battery pack. Extends life and prevents pack failures from vibration or drops. This unique design also allows the battery to operate in extreme cold weather conditions. REDLINK intelligence features overload protection to prevent you from damaging your cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. Includes: (1) M18 RedLithium XC5.0 extended capacity battery pack.