https://wccftech.com/iphone-12-pro-worse-battery-life-vs-iphone-11-pro/

Both the iPhone 12 Pro and iPhone 12 Pro Max feature an astounding number of upgrades compared to their predecessors, the iPhone 11 Pro and iPhone 11 Pro Max. The addition of a 5G modem, to a new camera system, plus a chassis that’s smaller in volume all point towards the many changes Apple incorporated.

Unfortunately, these new changes, coupled with the fact that adding new parts can often mean compromises elsewhere, it appears that the iPhone 12 Pro won’t improve in battery life compared to the iPhone 11 Pro. In fact, according to Apple’s stats, the newer 6.1-inch premium model could deliver worse battery life, according to these numbers.