EGO ZT4215S Z6 42in Zero Turn Riding Mower e-STEER 6 Batteries. The next-generation EGO 42 in. (1) ZT4215S 42 in. Z6 Zero Turn Riding Mower with e-STEER Technology. (2) 56V 10.0Ah Battery. (4) 56V 6.0Ah Battery. Peak Power technology combines the power of up to six 56V batteries for gas-like performance. E-STEER technology enhances control and maneuverability with an electronic steering wheel. Why Shop With Us? WORLD CLASS CUSTOMER SERVICE. Our support agents are here to assist you, Monday through Friday. Photo evidence of damages may be required.