Nextbigfuture simplifies it. The batteries are getting a lot better and the technologies pursued by Tesla will be mass-produced in larger quantities and lower cost than current batteries. The batteries are improving faster than analysts have predicted in the past and improved batteries are not fully included in estimates of total terawatt-hours of battery production in 2030. The estimates of battery production are based on capacities of battery factories based upon current technology.
What does this mean?
Batteries will get over four times better in energy density and costs. Instead of 30-40% of new vehicles becoming electric by 2030, there will be 100% of new vehicles becoming electric before 2030. The performance and specifications will not just match combustion gas cars but will be vastly better.
The battery performance will be so good that new applications like large passenger planes will become electric with superior range. However, these projects for adapting and creating new technology that is borderline feasible will take longer.
Electric cars, bikes, buses and trucks are already being commercialized. There are already dozens of battery gigafactories. Some of gigafactories are Tesla and some are CATL, LG, Panasonic and others. There will be dozens of terawatt hour battery factories.