This Galaxy S21+ battery life test shows where Samsung did 'pull out all stops'

While one would expect the Ultra to last less than the S21+, for instance, which has almost the same battery capacity and a 1080p display, our battery benchmark tests showed that the opposite is true.

What gives? Well, this time around the QHD display on the S21 Ultra is of the latest-gen frugal LPTO variety, not the LTPS panel with static 120Hz refresh found in the S20 Ultra. That alone would amount to a 15-20% diminished power draw. 

When we add the more granular dynamic 10Hz-120Hz refresh rate that its latest-gen LTPO panel allows, compared to 48Hz-120Hz on the S21+, the battery savings may be as significant as having a lower-res display. 

That's precisely what happens in our Galaxy S21+ vs S21 Ultra battery life round as you can see from our benchmark tests here, as the S21 Ultra lasts even longer, despite that the S21+ has a lower-res screen, and only a slightly smaller battery. 

The S21 Ultra, however, comes with a different display technology and refresh rate management than the S21+, which might explain why it does wonders in the endurance department not only among the S21 series, but among all of its peers, too. Surprisingly, the S21 Ultra wins the fast charging round, too, as it fills up a slightly larger battery for a slightly shorter time on the same 25W charger, proving once again that Samsung has indeed "pulled out all stops" in making its most specc'd-out phone to date.