Hi, I have a ring doorbell 3 plus which I purchased in May / June of 2020. I purchased a second battery in November 2020 so that a second battery was ready to go when the current one run low and needed replacement. However, both batteries now (when fully charged) are only showing 2% battery life and critically low. Would both batteries simultaneously came to their end at exactly the same time despite being purchased 6 months apart or do I have another problem? Any help appreciated.