I recently bought Fatshark dominator set, but I have problem trying to charge the battery that comes with it. When I plug it in to the phantom charger, only the 2S light blinks, slowly once in 3 - 4 seconds. Kept it like that for few hours, nothing seemed to change. The other lights stay dim. I tried plugging it into the goggles, everything seems to work, and there seems to be enough charge in the battery, not sure how much. I tried measuring the voltage with multimeter while plugged into goggles. One cell gives 3.81V other one 3.84V. Any ideas what could be the problem?