I do not separate it from my computer:-).
Let it charge for about 20minutes when before use it at first time. (Posted on 3/29/12)

I don't even know how I lived without my passthrough!! It really is a must have item if you use the Dura-C 510. My batteries work fine but it gets to be annoying always having to charge them and I would forget sometimes and then have to wait for an hour before I could use my e-cig but now that never happens.

I save my batteries for when I need them and use my passthrough most of the time. I can plug it into my USB port and vape at full power whenever I want. What's also neat is that when it's disconnected, it still holds a charge for quite some time, so that I can use it when I'm driving around not plugged into anything. I haven't tested out how long but i know it's lasted at least an hour and a half once not plugged into anything. So nowadays, I mainly use my passthrough and only use my batteries when I'm going out and don't want to deal with a wire. It's awesome and I really recommend getting one. (Posted on 4/1/11)