What type of clearomizers?
I have had occasional problems with Volts because they were not making a connection...battery post gets pushed in when charging or something. They seem to always work fine with Smokeless Image cartos. Anything else sometimes needs fiddling with the battery post.
Did your previous clearomizer work on the batteries? If so, then you have a bad coil on that wick. in other words, the clearo parts would be the problem, not the batteries.
every once in awhile (rarely but still) when I use my protank, and change out a new head, the head will be flawed and not work. things happen, and let me tell you..... I've had my share of ecig problems as well..... dont give up