> edit- and push to get a standard for battery pack sizes to reduce the number of form factors, then implement a service where you give your used one at departu

> edit- and push to get a standard for battery pack sizes to reduce the number of form factors, then implement a service where you give your used one at departure and get a new one at arrival. Or we could implement the Indian system, where you turn in your new batteries at departure and are given used ones on arrival. (Mysteriously, despite the assurance that they are the same batteries, they have sometimes changed brand, too.)