hasher - re battery life, PCC's can be a big help. It's a case with a battery in it. You charge the case overnight and charge your
batteries too (I do them separate from the PCC), then during the day you can be using one battery and charging the other in your pocket. I mainly use the PCC to charge when not at work or at home, but I use it every day to carry some gear. many super-mini PCCs can charge 1 battery at a time while carrying one other battery and some carts or cartos. Mini+ PCCs often just fit the one battery they are charging and 2-3 carts or cartos. Some brands have PCCs but not all do.
I think the only way you can get 8-hour to all day battery life out of one battery for a heavy vaper is by going to a larger-than-mini unit like the fat-battery Riva or Ego or to other shapes that don't look like a cigarette.
I know V4L has a PCC for (I think) standard and shorty
batteries (for KR8 which is their vapor king) but I don't know if it has one for XL
batteries. I think it can charge an XL battery if the PCC case is left open.
I think many PCCs can do about 4 recharges.
BTW - if you haven't looked at them, check out in the New Member sticky threads - the Library thread for the multipart guide especially starting at part 4+ where some popular models start to be shown. And the newbie videos thread where you can see some of those models in use. There are also a ton of review/comparison videos of those models on Youtube. Hard to tell how big the demonstrator is but it will give you an idea of what they look like in use.