The EGO POWER+ 56-Volt 2.5Ah battery with upgraded fuel gauge uses industry-leading ARC-Lithium technology to deliver Power Beyond Belief and is compatible with all EGO outdoor power equipment. Keep-Cool battery technology keeps each cell cool for long life and to work in the most extreme conditions. Upgraded integrated fuel gauge to let you know how much power is left in your battery Unique ARC design and Keep-Cool battery technology keep each cell cool for long life and hard work in the most extreme conditions Long-lasting power, rapid charging and durability in all weather conditions Fast Charge time: Charges in 30 minutes with EGO Power+ Rapid Charger Charges in 50 minutes with EGO Power+ Standard Charger ARC Lithium™ battery is compatible with all EGO Power+ Equipment and chargers *Charger Not Included