Keypad Battery - How long does yours last?

I read on the Ring site the keypad battery should last 6-9 months depending on usage and power save mode. Mine was fully charged a week ago, and is already down to half. So, I will get about 2 weeks out of it. Is this normal? I do not run power saving mode, and its use is average. I would not expect it to drop from 6 months to 2 weeks with average use! This 6-9 months rating must be if you don't even touch it! Or, is mine defective?