Ring Door 2nd Generation Battery Life

I brought my 2nd generation video doorbell in August 2020, and never had any issues with battery life (even in cold weather). However, the last couple of weeks the doorbells built in battery is not holding its charge. For example I charged the doorbell battery to 100% last Sunday and by Saturday morning it was already down to 5%. I haven’t changed any of my settings from what they normally are, and the doorbell hasn’t been used/set off more than normal. The Motion Sensitivity and Parcel Sensitivity are both set to the mid point (as through trial and error we found that was best for us), and the Motion Frequency is set to Periodically. This makes me wonder if the issue is with the battery (as opposed to our settings).