The designing and inventing a electricity generator prototype using mechanical energy charging to a battery with an alternator. Twenty-one inches diameter of bicycle wheel mounted cooperated to work with regular 12 volts 60 ampere alternator with 1/3 hp pressure pump. Water pump efficiency and charging batteries both at normal work and pumping water were studied. Electricity charging could display by ammeter, voltmeter, and lamp. The results found that electricity generation efficiency of the pump was 80% of normal pumping with average current 3.5 amperes and average voltage at 14.01 volts which fulled the 12 volts 3 ampere-hour battery in 1.5 hours.