The Milwaukee 48-11-1850 Battery features a 5.0 Amp hour - 90 Watt hour battery, which provides long-lasting power for Milwaukee M18 cordless tools. It is designed with REDLINK Intelligence that offers overload protection to prevent damage to your power tools. It has an onboard fuel gauge to monitor the charge precisely, so less downtime on the job. The battery is durable, efficient, and has minimal power loss.