Here’s how the 120Hz mode affects battery life on Galaxy S20 series phones

Samsung Galaxy S20 Series All Three

Samsung Galaxy S20 Series All ThreeSource: Android Central

What you need to know

  • Analysis from AnandTech has shown just how power-hungry the 120Hz mode on Galaxy S20 series phones is.
  • The Galaxy S20 Ultra incurs a significant 20% battery life penalty when the display refresh rate is set to 120Hz.
  • Samsung's smaller Galaxy S20+ also incurs a similar battery life penalty with the display set to 120Hz.

Samsung's latest Galaxy S20 series phones boast best-in-class Dynamic AMOLED displays with Quad HD+ resolution and a 120Hz refresh rate. Like other phones equipped with high-refresh-rate panels, however, switching to a higher refresh rate results in lower battery life. As noted by our very own Andrew Martonik in his Galaxy S20 Ultra review, turning on the 120Hz mode can lead to a 20-30% reduction in battery life.

Our colleagues at AnandTech have now published an extensive analysis showing just how much of an impact the 120Hz mode has on the Galaxy S20 and Galaxy S20 Ultra's battery life. Unsurprisingly, they found that the 120Hz mode has "quite a large power impact." The base power consumption degraded by nearly 180mW with the 120Hz mode enabled on the Snapdragon 865-powered Galaxy S20 Ultra. Similar degradations were also observed when switching to 120Hz on the Exynos 990-powered variants of the Galaxy S20 Ultra as well as the Galaxy S20+.

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Galaxy S20 Series 120 Hz Power ConsumptionGalaxy S20 Series 120 Hz Power Consumption
Web Browsing Battery Life S20 SeriesWeb Browsing Battery Life S20 Series
PC Mark Battery Life S20 SeriesPC Mark Battery Life S20 Series

Source: AnandTech

In the web browsing test, the Snapdragon 865-powered Galaxy S20 Ultra achieved 20% lower longevity in the 120Hz mode, faring worse than other phones with high-refresh-rate displays. The Exynos 990-powered Galaxy S20 Ultra, as well as the Galaxy S20+, incurred equal battery life penalty when running at 120Hz.

In PCMark's battery life test, switching to 120Hz resulted in 25% lower battery life figures for the Snapdragon 865-powered S20 Ultra. The Exynos variant of the phone fell behind the Snapdragon variant by 27%, confirming the Qualcomm chip's superiority in terms of power efficiency. The Exynos 990-powered Galaxy S20+ also fared "poorly."

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