The EGO POWER+ 56-Volt 7.5Ah battery uses industry-leading ARC Lithium™™ technology to deliver Power Beyond Belief™ and is compatible with all EGO outdoor power equipment.The 7.5Ah ARC Lithium™ Battery is now equipped with an upgraded fuel gauge. The new built in indicator lights lets you see how much run time you have left. With 5 segments wrapping the power button, you can now see how much battery power you have left in 20% increments. The ARC Lithium™™ battery technology is the industry’s most advanced; equipped with patented Keep Cool Technology; which keeps the cells cool and prolongs the life of the battery.When it comes to charging, the fan-cooling system allows the battery to start charging sooner and finish faster. With our standard charger, the full recharge time is 145 minutes, but this is reduced dramatically when using our rapid charger, to only 60 minutes.