Features and Benefits:Battery charge level with 4 bright green L.E.D. indicators allows the user to clearly see charge level;Reaches full charge in 45 minutes or less;Enhanced cooling system is engineered to maximize battery life;XGT® batteries features an advanced design impact-resistant outer case and shock-absorbing inner-liner engineered to protect the battery in harsh jobsite environments;The digital communication within XGT® optimizes performance to provide up to 2X longer sustained power under heavy-load applications;XGT® Tools and Batteries are designed with a multi-layer contact interface for more constant power delivery to take on high-current demands;The digital communication within XGT® actively monitors and protects against overload, over-discharge and overheating;XGT® Batteries feature rigid rails with impact-resistant construction to secure the battery to the tool during high-demand applications;The 40V max XGT® 4.0Ah Battery is engineered to outlast the competition. XGT Batteries feature an advanced design with an impact-resistant outer case and shock-absorbing inner-liner that are engineered to protect the battery in harsh jobsite environments. XGT Batteries also feature rigid rails with impact-resistant construction to secure the battery to the tool during high-demand applications.40V max XGT Batteries are equipped with smart technology. The digital communication within XGT Batteries optimizes performance to provide up to 2X longer sustained power under heavy-load applications. The digital communication within XGT Batteries and Chargers (sold separately) actively monitors and protects against overload, over-discharge and overheating. This advanced charging technology helps optimize battery life and deliver a faster charge. The battery reaches a full charge in only 45 minutes or less.