I remember at some point ghl stated they planned on making an external charger but also identified third party external chargers that would work with their batteries.
I asked for a recommendation on external chargers and they declined to say, citing 'liability' as the reason. I was expecting that to be the answer but intrigued seeing your note.
For someone who asked earlier, I almost never use the hydra tube.
I don't think there's any reason to put anything in the mouthpiece. I understand wanting to load more, but I can't see how that'd work at all. I have a friend's hopper now fyi.
After a week + of heavy use, the back end is getting hot (untouchable) more often than not. It's manageable but they've already replaced it once. No issues with functionality other than the back end. It's a lot of load charge, load charge, load charge....
But, I can't seem to put it down for long though.... I could go on and on about the flavor and the hit capacity, damn. Nothing I've used beats it. If your tolerance is low or moderate & you don't burn a lot you'd never need anything else in terms of a portable.
My only criticism comes as no surprise as someone being a heavy user using (in theory) a one hitter.