Okay, could you post a link to the charger you used?
I usually go with
this one, because there's less garbage to throw away after I take it apart. Sometimes, I'll use
this one instead, because you can get a USB connector if you need it, or just use the wire from the cable. The both also have LEDs that can be salvaged.
Also, one more question, I know how the connector is supposed to be wired but can't see the wires, especially the ground. Do you have the ground running under the voltage regulator and soldered to the negative plate of the battery holder?
It's connected just like any other voltage regulator setup. The center pin from the voltage regulator is soldered directly to the negative battery plate -- it's close enough that you can bend it so that it's almost touching, and then just blob the solder on to connect them.
So basically:
Red wire: From positive battery connection, to the switch (or just solder directly, like the ground of the voltage regulator to the negative plate), then from the switch to the Vr In of the voltage regulator, then from the Vr Out of the voltage regulator to the center pin of the atomizer connection.
Black wire: From the center (ground) pin of the voltage regulator to the negative battery plate as discussed above.
Black wire: From the outer ring of the atomizer connection to the negative battery plate.
Does that clear it up? Really, it's all pretty standard, just hard to see in the photo, so if you've done these before, your instincts are probably correct.