I heard that the wired version of the Eufy Video Deurbel Dual 2 Pro has a pre-roll and the battery version has not. If I wire the battery version of the doorbell the battery level should not be an issue for a pre-roll.
The battery version does not do a pre-roll, regardless of if you have it wired in or not. For the battery version, all the wiring does is maintain battery charge.
The wired version does a pre-roll, but storage is local (i.e. not on a homebase) so if someone steals your bell, you lose the footage too (unless you’ve paid for the cloud subscription).