What is your actual use case for developing on battery power? Especially during this Work From Home era, aren't we all pretty stationary? I do c/c++ on a deskt

What is your actual use case for developing on battery power? Especially during this Work From Home era, aren't we all pretty stationary? I do c/c++ on a desktop during the day, then on the couch on a small ultrabook in the evenings. Battery is definetly more of a limiting factor if you have an laptop with an old battery, I suppose?