I'm so sorry I wasn't here to help you. My computer is down and my netbook can't handle even answering a post. I'm at my daughter's house right now if you ever have any questions email me at lisa@wordupecig.com I can get to that and I check it often. You can charge until it is finished it won't blow up. I have the 520 and everything is exactly the same as the 510 except for the longer battery life. The carts you just fill with juice, I haven't used the CE2 so I can't be much help there. The 520 is a solid unit and I have one and it is in heavy rotation daily. Any time you need anything I'm available at my email. Please feel free to contact me with any questions. Again I am sorry I've been AWOL but that will be fixed soon.
An idea how little I know, what is the CE2? is that the cartomizer I have that does not need the atty? From what I have read on here I am going to have to get the one that uses an atty to have any luck?