I am a fairly new vaper. Ordered a starter pack from Volt back in October, and I've smoked maybe 2 packs of analogs since then. It's working great as a replacement for me, but I'm having technological problems. 1 of the first 2 batteries that came in my starter pack won't charge. I ordered a replacement, and am having the same problem. The third is fine, so it's not the charger. Is this a common problem? Is it the brand? Or could I be doing something wrong? Help!