Apple throttles iPhone performance when battery capacity drops below 80%, but you can check throttling status in Settings and disable it or restore full speed with a $99 battery replacement.

Is your iPhone 16's battery as strong as day one? A quick check in settings reveals the truth and it could explain those sudden power drops.

Earlier this year, Apple retested the batteries of its iPhone 15 models and updated its battery life claims for the entire series, suggesting that they offer better longevity than previously thought.