The situation where I'd like (but don't expect) the Radius to last a full day, I'm in a semi-public space, with management that doesn't want me vaping in there. So in this situation, I'm vaping periodically and discretely, not all that much.
In lieu of the battery lasting all day, which I don't expect it to, I'd like to be able to easily change the battery, like nearly every single other replaceable battery 18650 device on the market (at least that I've come across).
I timed myself, and it took me 15.94 seconds to change the battery on my classic Ti, you're not going to come close to that with the Radius. This was with fumbling the cap while removing it, and missing my first shot at the threads closing it up (it's been a while), and it didn't take a five finger death grip to pull it off. If I were to drop the cap in public, I wouldn't be too worried about it getting lost, unlike the two small fiddly screws of the Radius.
So it just took me 59.41 seconds to change the battery on the Radius. It took about 17-19 seconds just to get the screws out. This was starting with the tank removed, so I wouldn't have to worry about firing off the device with the tank upside down while removing the battery, which regularly happens even while mindfully applying the five finger death grip that is necessary.
This is not progress, this is not good design.
They have a battery cap that works on their other devices, and is the same size as the Radius body, would it have been so hard to incorporate it into the Radius?
It's great other's have been able to justify their purchase and make it work for them. Every one of these workarounds involves some form of accommodating a poor design. At the price point of the Radius, I'm not looking for a kludge.
It's one thing to be known as a maker of conservative devices, it's another thing to produce a product whose niche is for people that want a ~$250 secondary or part time device.