The battery of the iPhone 11 Pro Max is thicker. After all, the capacity has increased a lot, which also makes the Pro Max heavier. The battery weights of the iPhone 11, the iPhone 11 Pro and the iPhone 11 Pro Max are 47, 48 and 65 grams, respectively. Last year, the battery weights of the iPhone XR, the iPhone XS and the iPhone XS Max were 46, 41 and 50 grams, respectively.
Of course, the disassembly of Diyuanying Vit is not professional enough, I believe you are still more looking forward to the professional disassembly from IFixit.