A bigger size on the iPhone 11 Pro Max means a bigger battery (Image credit: Apple) We can sum this one up fairly succinctly. The bigger the iPhone, the longer the battery life. This means the smaller iPhone 11 Pro has the shortest battery life of the trio, although it should still give you a full day's use under normal conditions. TAYUZH Battery for iPhone 11 Pro Max, 5000 mAh High Capacity Li-Polymer Replacement Battery Compatible with iPhone Model A2218 A2161 A2220 0 Cycle Spare Battery with Repair Tools & Instruction Viimon High Capacity Battery Replacement Kits Compatible with iPhone 11 Pro Max 6.5 Inch (2023 New Upgraded) with Adhesive, Installation Manual and Gold Space Gray Silver Midnight Green Capacity 1 64GB 256GB 512GB Size and Weight 2 Width: 2.81 inches (71.4 mm) Height: 5.67 inches (144.0 mm) Depth: 0.32 inch (8.1 mm) Weight: 6.63 ounces (188 grams) Display Super Retina XDR display 5.8‑inch (diagonal) all‑screen OLED Multi‑Touch display HDR display 2436‑by-1125‑pixel resolution at 458 ppi Apple iPhone 11 Pro Max. Dimensions: 77.8 x 158 x 8.1 mm Weight: 226 g SoC: Apple A13 Bionic APL1W85 CPU: 2650 MHz, Cores: 6 RAM: 4 GB Storage: 64 GB, 256 GB, 512 GB Display: 6.5 in, OLED, 1242 x 2688 pixels, 24 bit Battery: 3500 mAh, Li-Ion OS: iOS 13 Camera: 4032 x 3024 pixels, 3840 x 2160 pixels, 60 fps MOVFST Replacement Battery for iPhone 11 Pro,3700mAh Li-ion Polymer High Capacity Battery Fit for iPhone 11 Pro Model A2160 A2215 A2217 with Repair Tool Kits 1.0 out of 5 stars 1 $19.99 $ 19 . 99 ASDAWN for iPhone 11 Pro Battery Replacement (Not for 11/11 Pro Max), 3180mAh Higher Capacity Battery for iPhone 11 Pro A2215 A2160 A2217 with Professional Tool Set + Installation Instruction 3.2 out of 5 stars 12 Location & photo apps take a lot of juice; so I'm happy about my iPhone 11 Pro Max's current capacity. I keep Background Refresh OFF completely. Charge it up to 100% and may keep it on the charger a while longer sometimes; but never overnight. I try to run the battery down to 20% on occasion. On the other hand, the iPhone 12 has a 2815 mAh battery, and will last around 8 hours from doing similar activities. In terms of display size and resolution, both phones have OLED displays but differ slightly in size; the 11 Pro has a 5.8 inch display with 1125 x 2436 px resolution, but the 12 has a 6.1 inch display with 1170 x 2532 px M2kHtF.