Think about engineering tradeoffs: 1. Battery packs are structural - if you make them removable the car will be less rigid. 2. You have $X to spend. You can s

Think about engineering tradeoffs: 1. Battery packs are structural - if you make them removable the car will be less rigid. 2. You have $X to spend. You can spend it on improving rechargeability or making batteries swappable. 10% of your customers will swap battery packs ever, and 1% regularly. 10% of your customers will benefit from faster quick-charging times