The warning signs that your iPhone battery needs to be replaced

As iPhone batteries age, their chemical capacity naturally declines, leading to reduced performance and shorter runtimes between charges. Apple's lithium-ion batteries are designed to retain up to 80 percent of their original capacity at 500 complete charge cycles. Users can identify degradation through several key indicators: unexpected device shutdowns, sluggish app performance, or a noticeable decrease in the time the phone stays powered on throughout the day. To verify battery health, Apple provides a built-in diagnostic tool within the iOS Settings menu under Battery Health & Charging. If the maximum capacity has dropped significantly, the system may throttle performance to prevent crashes. Replacing a degraded battery can restore the device's original speed and reliability, extending the overall lifespan of the iPhone. It is recommended to monitor these metrics periodically to ensure optimal device functionality and avoid sudden hardware failures.