For some reason Apple has decided that users should not know about the amount of RAM and the actual battery capacity of its iPhones, and for years, we have had to rely on teardowns and filings with telecom regulators to learn those numbers.
The iPhone 11, the successor to last year's iPhone XR, has a slightly bigger battery and now comes with 4GB of RAM which will help keep more applications running in the background. Apple officially only says that this new iPhone has 1 hour longer battery life than the XR, so it admits to a slight upgrade.
One of the bigger upgrades in the iPhone 11, the successor to the iPhone XS, is a significantly bigger battery that elevates its battery life above that of the regular iPhone 11. Regulatory filings also confirm that Apple has included a quite reasonable 6GB of RAM on its smaller Pro iPhone. For years, Apple has been behind the pack in the amount of RAM and it now finally seems to at least catch up with some Android rivals in this regard.
The iPhone 11 Pro Max is the longest lasting iPhone this year. It now features a significantly bigger battery, and Apple's official numbers say that it lasts more than the iPhone 11 and the smaller iPhone 11 Pro. Last year, that was not the case: then, the affordable XR was actually the longest lasting iPhone.
The Pro Max also has 6GB of RAM on board, 50% more than last year's version.