The 21" Power+ Mower available in Self-Propelled! Receive all the torque of gas without the noise, fuss and fumes. The EGO 56V Lithium-Ion Mower is powered by EGO's high capacity 7.5Ah ARC Lithium™ battery. The Power+ 21" Mower delivers up-to 60 minutes of run-time (with included battery), rapid charging and durability in all weather conditions. The self-propelled function is variable speed, pick your pace. The advanced EGO POWER+ 56V ARC Lithium™ battery uses industry-leading technology to deliver Power Beyond Belief™ and is compatible with all EGO POWER+ products.