2.5 Ah 56-Volt Lithium-Ion Battery: Industry’s first and most advanced 56-Volt ARC Lithium-Ion Battery Keep Cool Technology: Keeps each battery cell cool for extended life Power Management System: Protects the battery from harsh elements Integrated Fuel Gauge: Shows how much power is left in the battery Fast Charge Times: 50-Minute charge time with EGO 56-Volt Charger 30-Minute charge time with EGO 56-Volt Rapid Charger Compatible with all EGO 56-Volt Power+ Outdoor Power Equipment 3 Year Warranty.