Galaxy Watch Active 2
Unfortunately, all we have to report right now about this mysterious gadget is its model number and battery capacity. The former hints at a clear family relation to both the OG Galaxy Watch and the still-fresh Watch Active 2.
If history is any indication, the SM-R840 will designate the larger version of this upcoming smartwatch, following in the footsteps of the SM-R800, aka 46mm Galaxy Watch, and SM-R820, aka 44mm Galaxy Watch Active 2. The 42 and 40mm Galaxy Watch and Watch Active 2 models respectively also go by the SM-R810 and SM-R830 labels, strongly suggesting a smaller SM-R850 variant of the SM-R840 is in the works too.
Of course, this could always end up as a third edition of the fitness-centric Galaxy Watch Active, a theory seemingly supported by the 330mAh battery size rumored today. If this turns out to be accurate, it would put the SM-R840 on largely equal ground as the 44mm Watch Active 2, but well below the 46mm Galaxy Watch, which packs a significantly larger 472mAh cell.