Samsung released its latest flagship smartphone Galaxy S23 Ultra in February this year and the company’s tech rival, Apple launched its competing flagship model iPhone 15 Pro Max in September, along with the iPhone 15 Pro Max, 15 Pro, 15 Plus, and 15.
In the battery tests of all four models of the new iPhone 15 series, the 6.7-inch iPhone 15 Plus took the crown with the longest battery life.
For those who want to which premium flagship smartphone has longer battery life, the iPhone 15 Pro Max or Galaxy S23 Ultra, here is their battery test result.
iPhone 15 Pro Max vs. Galaxy S23 Ultra: Specs and features comparison
| Specs | iPhone 15 Pro Max | Galaxy S23 Ultra |
| Processor | A17 Pro built on a 3nm process (6‑core CPU and 6‑core GPU) 16‑core Neural Engine | Qualcomm Snapdragon 8 Gen 2 built on a 4nm process |
| Display | 6.7-inch OLED screen 2796 x1290 pixels 120Hz refresh rate | 6.8-inch AMOLED screen 3088 x 1440 pixels 120Hz refresh rate |
| Battery | 4,422 mAh | 5000 mAh |
iPhone 15 Pro Max delivers longer battery life than Galaxy S23 Ultra
Although the Galaxy S23 Ultra features a bigger battery than the iPhone 15 Pro Max, it does not deliver longer battery life. Tom’s Guide and YouTuber @PhoneBuff ran battery tests of both smartphones and found that the 15 Pro Max lasts longer than its competitor.
For the test, PhoneBuff calibrated both smartphones to 200 nits with auto-brightness disabled and ran apps for web browsing, audio and video streaming, social media, games, and more. And battery test by Tom’s Guide involved continuous web surfing at 150 nits of brightness. Here are the results:
| Tester | iPhone 15 Pro Max | Galaxy S23 Ultra |
| Tom’s Guide | 14 hrs 02 mins | 12 hrs 22 mins |
| PhoneBuff | 11 hrs 44 mins | 11 hrs 06 mins |
Previously, Apple’s iPhone 14 Pro Max also outshined its competitor Galaxy S22 Ultra’s battery performance. The former hit 19 hours and 5 minutes of battery life against the latter’s 13 hours and 17 minutes which suggests that high-end iPhone models are more power efficient than Samsung’s Galaxy S flagship phones.
