When you charged the batter did one of the lights go off to indicate it was fully charged? Also how old are the batteries? They do have a finite life as being outside in extremes of temp is not ideal for batteries so you will need to replace with a new battery eventually.
Hi neighbors. If you have fully charged your battery and have tried a factory reset but your Doorbell is still unresponsive, give our support team a call at one of the numbers available here for further assistance. If you are outside of the US, please visit here to see how to contact support.