I recently purchased an Innokin iTaste VV which I am most pleased with. However, I noticed it only charges up to 4.2 volts before the automatic shut-off takes effect. I called the dealer who sold it to me and they told me that was normal. Most of their batteries do the same thing. It seems odd it is adjustable up to 5.0 volts if it is only capable of charging up to 4.2. Does anyone have any insight, either specific or generic?