The EGO 56V 2.5Ah ARC Lithium Battery uses industry-leading technology to deliver Power Beyond Belief. Its patented ARC Lithium design keeps the battery from overheating by pushing heat away so your equipment runs longer at full power. Its durable, shock-resistant design protects batteries from drops and the elements. Intelligent power management monitors and optimizes each individual battery cell to maximize power, performance, and runtime. This 2.5Ah battery features a fuel gauge with built-in indicator lights that show how much runtime is remaining in 20 percent increments. The 2.5Ah battery fully charges in 30 minutes with the included EGO POWER+ 550W Rapid Charger. With the industry's most advanced battery technology, every EGO tool delivers or exceeds the power and performance of gas without the noise, fuss, or fumes.