No doubt battery technology will evolve. 10 years from now, current battery technology will be considered primitive. Zinc-air, Lithium-air which one? Metal–Air Batteries with High Energy Density: Li–Air versus Zn–Air https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201000010 This is a very long and complicated paper. There is a conclusion section that summarizes the differences.