138,404 points. Posted on Sep 25, 2021 2:30 PM. General thought is the battery is OK up to 80%. But if your phone is displaying the service battery at 85%, I'd pay attention to it and pay to have the battery replaced at your Apple Store or Apple Authorized Service Provider. Do NOT get a battery at your average iFixit type store, even if less
Never had a better battery and longer lasting phone - coming from an 8 Plus and 6/S Plus. My refurbished and 9 month old MacBook Pro 16 on the other hand is down to 87% already. The MacBook Air 2011 that I used for over 8 years was down to 78% when I sold it. Plugged in most of the time with around 400 cycles. lXLvL.