Well lets see if I can help you a little then. 1st off, a manual battery just means you press a button as you're vaping which heats the coil, whereas an automatic, you just suck. I prefer the manual, as you can control how much you heat the coil vs how hard you vape.
Secondly, whilst a personal charger sounds really handy, I've honestly been using my 1st of these batteries for 2 days now without a charge, and its still going! If I'm out of the house for a while, I just take my case with spare batt with me...the case also has some other flavours in it for if I fancy a change.
The stainless Riva does look excellent, but after I got mine, another new user tried to order one but couldn't find it on the site, so perhaps a quick call to Vape Escape may be needed to get a stainless model.
As I said, I have no experience with the jacvapour but I'm sure searching around here, someone will have used one
DM