Seems that charging with USB is not for you for some reason 
U must go for a mod with replaceable battery + external battery charger + couple of spare batteries and u are set up bro..
Think about how better it is even if u run out of battery u got another fully charged with you and swap and keep vaping like a boss....the only good thing about internal battery mods is that u can find very smaller size ones....besides that there is no reason to prefer using internal battery mod...
About what atomizer to use with it we need to know what resistance and wattage u usually vape and if u use rebuildables or not with disposable coils
U must go for a mod with replaceable battery + external battery charger + couple of spare batteries and u are set up bro..
Think about how better it is even if u run out of battery u got another fully charged with you and swap and keep vaping like a boss....the only good thing about internal battery mods is that u can find very smaller size ones....besides that there is no reason to prefer using internal battery mod...
About what atomizer to use with it we need to know what resistance and wattage u usually vape and if u use rebuildables or not with disposable coils