Solar powered irrigation controller run on nickel-metal hydride rechargeable batteries. ... SundayPower three pieces battery, voltage:3.6v/pc,solar batteryIrrigation timeMinimum: one minute,maximum:9hours and 59minutesIrrigation ... , should be change the battery. 2,If the controller have full battery, take out the battery, use ... :17.5kgs5.master quality:50pcs/carton Solar Powered Irrigation Controller