The summary of the section “We need better batteries” is that the batteries need a lot of work.
They lack adequate energy reserves. We need to be able to store a lot of energy if we want to use solar and wind energy. In this way, even on overcast, windless days, we can still have electricity. Many scientists are attempting to develop better batteries that last longer, store more energy, and enable us to store more energy so that solutions like solar (which is not always available) become practical.
The lithium-ion battery, which is frequently seen in cell phones and laptop computers, is one potential form of battery. These batteries can store a lot of energy in a short amount of area and are lightweight (lithium is the lightest solid chemical element).
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