Hi I bought 2 pack Nest Cam (battery) from Walmart 4 months ago and they were both connected and plugged in and working. One on front yard and other in back yard. Now front yard one doesn’t have any battery and it does not charge at all. I’ve checked the cord, power brick and kept it in house to try to charge it either. I have also tried to reset it. Please help it is so new and it stopped working.