Question: My iPhone battery health just hit 80%. Should I replace it now or wait?
A
Answer: Only if the phone is already letting you down, or if AppleCare+ will pay for it. 80% is the point Apple designs its batteries to reach after 500 or 1,000 full charge cycles, not a date when the battery fails. If your iPhone still gets through the day and Battery Health says "normal peak performance," you can wait. If it dies by mid-afternoon, shuts off in the cold or feels slow, a new battery for $89 to $119 is usually the best money you can spend on it (Apple's US prices as of October 2026).