Never thought to call them that, but it is accurate haha!
I actually keep a small one of these with a tiny USB-C cable tucked in my back pocket. When making a cafe stop (depending on the battery level), I’ll just plug the device in for 15-20 minutes while we’re stopped and that’s always been enough to get me back home last year (though my most common use scenario was < 160 km rides). Not sure exactly how much more riding @GoustiFruit is doing 