I find it interesting that Tesla was building the world's largest battery while claiming the Model 3 was delayed due to battery pack assembly issues.
To date, our primary production constraint has been in the battery module assembly line at Gigafactory 1, where cells are packaged into modules. Four modules are packaged into an aluminum case to form a Model 3 battery pack. The combined complexity of module design and its automated manufacturing process has taken this line longer to ramp than expected. https://electrek.co/2017/11/01/tesla-model-3-production-delays/