Looks like this year at Apple, big is in. The iPhone 11 Pro Max's powerhouse pumps out 3969 mAh at 3.79 V, for a total of 15.04 Wh. That's a whopping 2.96 Wh more than the XS Max battery, and 1.52 Wh less than the Galaxy Note 10+ 5G battery.
Where does this massive power come from? It's 4.6 mm thick, has a volume of 23.8 cm³, and weighs in at 59.6 g. Compared to the XS Max, that's 0.7 mm thicker, 4.2 cm³ larger by volume, and 13 g heavier.
We saw this same single-cell, L-shaped design last year in the iPhone XS, where we learned about the complexities of internal corners and thermal expansion in battery design.