It is always difficult to gauge the ability to vape in public... it depends on many factors.
For instance, vapes like the MFLB, Palm, Firefly, Genie, Lotus, Vapman, Vaponic and others with heat on demand that cool quickly are great for a couple of hits, either in a more secluded place or discreetly in a more open space.
I have used the MFLB, Genie, Lotus, Vaponic, Solo and DaVinci in public and while i can use the DaVinci without no one knowing what i'm doing it is weird for a grown man to be with a portable radio in his hand sucking on the antena....
The ones you can hide while hittting and heating are the best IMO. The Vapman, Vaponic, Genie and Lotus have the lighter problem but the genie looks like a pipe so in most instances no one will make much of it. The Vapman can be hidden and so can the Vaponic so unless you need silence it is pretty stealthy in 90% of ocasions. The Lotus is the worst on the open but you can vape a load so fast that 1min in the bathroom will be enough for promising results.
Personally i didnt like to use the Solo outside, but a friend of mine used it with no problems...
I maintain my opinion the Pinnacle is the most balanced in a battery vape. The Solo is too big and heavy to carry around, The FF is great but no autonomy for me...
So, in the end, if it's true stealth you're after, get a LB and another portable to vape without having to be next to a plug.
If you don't care for stealth that much but care a lot for autonomy, the 45min in the Pinnacle might be short for you.
I'm sticking to flame vapes until there comes a 2h vape with great flavour and small.