CPU clock speed is the best example to illustrate this concept. Intel makes a single chip and sell it at different clock speeds at different price points. Cost is all the same pretty much. Just a different limit written in the software. In this case buyers are at the time of purchase informed of the fact that they can upgrade later to 75kWh through software upgrade if they so desire. So no harm done. There of course are some ignorant people who are upset at the very concept of software capping in anything. Reasonable consumer will be fine with it and will be grateful actually that they can buy it cheap in the beginning and upgrade it later if needs be.