When some background task is running, its normal for the battery to drain faster. However, some users complain that after updating to
iOS 16, the battery drain is massive. This is not an issue that is exclusive to the iPhone 14 series.
Some netizens said that the new system "completely destroyed the battery life on the iPhone 13 Pro. The iPhone 14 Pro battery life was good at the beginning, but now the battery life is shortened to 4-5 hours."