Dual poer mode on Ring Spotlight Cam Plus

I have 2 Ring Spotlight Cam Plus units. I bought one in June 2023 and now another just this week. The original goes into dual power mode when the wire power is shut off. The new camera does not and will fully drain the battery in 3 hours. The power mode on both only shows wired or battery mode, no dual mode. Like i said, the ffirst camera goes into low power mode but the new does not after power is removed. I swapped the batteries around to make sure it was not that.