4.0 Ah 56-Volt Lithium-Ion Battery: Industrys first 56V battery40% More Power: Compared to the leading 40V BatteryPatent Pending Keep Cool Technology: Keeps each battery cell cool for extended lifePatent Pending Power Management System: Protects the battery from harsh elementsIntegrated Fuel Gauge: Shows how much power is left in the batteryFast Charge Time: Charges in 30 minutes with the 30 Minute Charger80-Minute charge time with Standard charger30-Minute charge time with 30-Minute chargerCompatible with all EGO Power+ Power Equipment