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4 Signs You May Need to Replace Your Solar Batteries Solar lights need a rechargeable battery, solar array, controller, and an LED bulb to function properly. Solar batteries store sun-generated power—a solar array or small photovoltaic cell is responsible for capturing sunlight during day light hours, and then the solar energy is converted into electrical energy. A ‘charge controller’ ensures that the batteries do not get overcharged and monitors the amount of light and turn the LED light...