Myepack are a good vendor, used to be on here, & to my knowledge & experience have good customer service, so well worth getting in contact.
As far as batteries & charging are concerned @MrDJ advice is right. Very few mods are designed for USB charging & in multicell mods there needs to be a balanced charge otherwise batteries deplete unevenly. As a short term stop gap USB charging is ok, but always better to err on the side of caution.
AA/AAA chargers aren't designed for 18650 etc as different chemical make up & 1.5v compared to 4.2v for vape batteries. Size will also be an obstacle .
Thank for the tips.
I will get the device and see how i get on with it, and then start looking into accessories. Who doesn't like new gadgets