Battery life in motion detector + outdoor siren

A newbie here. I am thinking about purchasing the Ring security alarm but I have three concerns and would like to ask for your advice. 1. Can somebody share how long does the battery last in a motion detector that is located in a living room or any other heavy traffic area? As of 12/04/2021: 1. Is there any update if Ring made a modification of the system to stop detecting of any motion by the motion detectors when the system is in the OFF status? (to stop draining the battery) 2. Is there any update on when we can expect the Ring outdoor siren available again in the US? (a deal breaker for me) Thank you very much