I have the V5 and prefer it with the pair of 18350 as it just functions better though I do use a 18650 when charging. I've had no problems at all with mine regardless of the 18350 or 18650 in use. I'm using mostly Aspire clearomizers though I do have a couple of others I also use. Most of mine are in the 1.5 to 2.2 range. I also tend to run in ww mode as it is easier to get it consistent.
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