Litepanels battery question
 

I have 3 Litepanels miniplusses and one of the battery packs seems to be charging strangely, the battery gauge flashes and only draws 1 or 2 watts and the other two seem to draw 5 or 6 watts. Just wondering if it sounds like a defect of one of the batteries? I've had them for less than a year and assume it would be covered under warranty if not.