I just picked up a couple of new packs and one of them refuses to charge. I checked the individual cell voltages and all four are at 3.76v. When checked at the main connector I get 15.04v. When I go to charge, or discharge it using my charger it immediately errors out and says "Invalid cell count" All my other packs charge normally. Anyone had that issue? Or have an idea of what might be causing it? The vendor is sending me a new pack, but I'm just curious.