Your last-ability on a Radius will vary, depending on how much you
vape and how high your watts are. If you're the kind of vapor pushing the limit (40 watts) and you
vape non-stop, your battery life will be hours, not days. If you're anything like me (a Tootle Puffer) who vapes all day long at 9.8 watts, you'll get way more than a full days charge out the battery in the Radius. I can get two days with mine and I vape all day, from 7:00 am until I go to bed around 11:30 pm. But, I charge every night while I'm sleeping because JohnDo, splained quite nicely, btw., that charging more often, for less time is actually better for the battery. Given I do this, I'll NEVER need to worry about running out of charge in a single day.