Comparing the battery life of the Samsung Galaxy S25 Edge to the S20 series, particularly when using a 120Hz refresh rate, involves several factors including battery capacity, charging speed, and display technology.
Galaxy S25 Edge
- Battery Capacity: The Galaxy S25 Edge has a rated battery capacity of 3,786 mAh, which is marketed as 3,900 mAh. This is smaller than the batteries in most S20 models and even smaller than the regular Galaxy S25's 4,000 mAh battery[1][4].- Charging Speed: It supports 25W wired charging, which is slower than the 45W charging available on some S20 models like the S20 Ultra[1][3].
- Display: The S25 Edge features a 120Hz refresh rate screen, which, like the S20 series, will consume more power compared to lower refresh rates[1][5].
- Performance: Powered by the Snapdragon 8 Elite SoC, it should offer efficient performance, but the smaller battery size may limit overall battery life[1][4].
S20 Series
- Battery Capacity: The S20 series had larger batteries, with the S20 Ultra featuring a massive 5,000 mAh battery. Even the S20+ had a larger battery than the S25 Edge[8].- Charging Speed: The S20 Ultra supported up to 45W charging, which is faster than the S25 Edge's 25W[8].
- Display: The S20 series also offered 120Hz refresh rates, which significantly impacted battery life. For example, the S20 Ultra's battery life dropped from about 12 hours at 60Hz to around 9 hours at 120Hz[8][11].
- Performance: The S20 series used both Exynos and Snapdragon processors, with the Exynos versions generally having poorer battery efficiency compared to Snapdragon models[2][5].
Comparison
- Battery Life at 120Hz: Given the smaller battery size and similar display technology, the Galaxy S25 Edge is likely to have shorter battery life at 120Hz compared to the S20 Ultra. However, the more efficient Snapdragon 8 Elite processor might help mitigate some of this difference.- Design and Charging: The S25 Edge's slim design and slower charging speed may further limit its appeal for users prioritizing battery life and quick charging.
- Overall Performance: While the S25 Edge offers strong performance and camera capabilities, its battery life might not be as robust as some of the larger S20 models, especially at higher refresh rates.
In summary, the Galaxy S25 Edge's battery life at 120Hz is expected to be less than that of the S20 Ultra due to its smaller battery size and slower charging speeds, despite potentially more efficient hardware.
Citations:
[1] https://www.gsmarena.com/samsung_galaxy_s25_edges_battery_capacity_confirmed_through_certification-news-66882.php
[2] https://9to5google.com/2020/03/24/galaxy-s20-exynos-battery-120hz-display/
[3] https://www.tomsguide.com/phones/samsung-phones/samsung-galaxy-s25-vs-galaxy-s25-plus-vs-galaxy-s25-ultra
[4] https://www.sammyfans.com/2025/03/11/samsung-galaxy-s25-edge-battery-is-smaller-than-the-s25-capacity-revealed/
[5] https://www.anandtech.com/show/15603/the-samsung-galaxy-s20-s20-ultra-exynos-snapdragon-review-megalomania-devices/11
[6] https://www.androidpolice.com/samsung-galaxy-s25-review/
[7] https://www.gsmarena.com/samsung_galaxy_s25-review-2794p3.php
[8] https://www.techradar.com/news/the-samsung-galaxy-s20-ultras-120hz-display-is-a-huge-battery-hog
[9] https://prelaunch.com/product-blog/samsung-galaxy-s25-edge-vs-galaxy-s25-plus
[10] https://www.pcmag.com/reviews/samsung-galaxy-s25
[11] https://www.phonearena.com/news/120Hz-vs-60hz-battery-life-comparison-samsung-galaxy-s20-ultra-plus_id122967