iPhone 13 Pro Max battery capacity drops rapidly. Bought the phone in August 2022. The first percent dropped on July 1, 2023. Now it has 92 percent on it already. Dropping steadily every 3 weeks (at least the last 3-4 percent). I don't heat it up, it works fine. Always charge to 95-100 percent.
The iPhone 13 Pro has a 6.06 inch (154 mm) (marketed as 6.1-inch (15 cm)) OLED display with a resolution of 2532 × 1170 pixels (2.9 megapixels) at 460 PPI, while the iPhone 13 Pro Max has a 6.68 inch (170 mm) (marketed as 6.7-inch (17 cm)) OLED display with a resolution of 2778 × 1284 pixels (3.5 megapixels) at 458 PPI. Compare features and technical specifications for the iPhone 13 Pro, iPhone 13, iPhone 13 Pro Max, and many more. Apple; Battery. Up to 23 hours video Capacity 1 128GB 256GB 512GB 1TB Size and Weight 2 Width: 3.07 inches (78.1 mm) Height: 6.33 inches (160.8 mm) Depth: 0.30 inch (7.65 mm) Weight: 8.46 ounces (240 grams) Display Super Retina XDR display with ProMotion 6.7‑inch (diagonal) all‑screen OLED display 2778‑by‑1284-pixel resolution at 458 ppi Apple iPhone 14 Pro Max (Max Auto) 0: 1760: ∞: Apple iPhone 13 Pro: 0: 856: The iPhone 14 Pro brings a minor battery capacity upgrade over the previous generation - about 3% - from 3,095mAh