Discover the key differences between flow batteries vs lead-acid batteries. Learn about their efficiency, lifespan, cost, and best applications to help you choose the right energy storage solution. When discussing energy storage, one thing that often causes confusion is choosing the right type of. Though the renewable energy battery industry is still in its infancy, there are some popular energy storage system technologies using lead-acid and high-power lithium-ion (Li-ion) combinations which have led the market in adoption. Even so, those aforementioned battery types have deficiencies. They. This technology strategy assessment on flow batteries, released as part of the Long-Duration Storage Shot, contains the findings from the Storage Innovations (SI) 2030 strategic initiative. The objective of SI 2030 is to develop specific and quantifiable research, development, and deployment (RD&D). Before lithium took over, lead-acid batteries were the only game in town. Lead-acid batteries generally have a lower initial cost, with price per kWh capacity ranging roughly from $50 to. The three most common choices today are lithium-ion, lead-acid, and flow batteries. Each type comes with unique features, pros, and cons that can impact how your solar system performs.