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Warning signs it is time to replace your iPhone battery

If an iPhone’s maximum battery capacity falls below 80 percent, the charge level drops sharply, the phone shuts down unexpectedly or heat increases, it may be time to consider replacing the battery. Apple lets users check battery health and performance in Settings. A significantly degraded status can trigger an on-screen recommendation. Newer models also show total charge cycles, and Apple recommends replacement when capacity dips below 80 percent.