Apple basically guarantees >=80% capacity after 500 charges within 2 years I believe. I wouldn't worry about 99%. Observe with coconutBattery. My iPhone 6s+ had 96% from factory and stayed that way for almost 2 years (observed weekly). My iPhone 6+ had 108% capacity and dropped to the upper 90s over 2 years. Protect & Prolong the life of your iPhone's Battery: Batteries - Maximising Performance - Apple (IN) Try some of these options too. Avoid Screen Mirroring. Put on Low Power Mode. Put Auto-Lock on (1 min):- with the Low power mode it will be 30 Sec. Disable Push notifications for apps you do not use often. Peak Performance Capability (Credit: PCMag/Apple) As your battery health degrades, so can its ability to deliver what Apple calls " peak performance ." Here are some potential messages you'll Some iPhone 11, 11 Pro, and 11 Pro Max users saw inaccurate reports of estimated battery health. Though this did not mean a problem with the actual battery health, it resulted in unexpected battery drains and even reduced peak performance. To fix this, iOS 14.5 recalibrates the maximum battery capacity and peak performance capability on the Go to Settings > Battery, then tap Battery Health & Charging. iPhone displays information about your battery’s capacity, peak performance, and whether your battery needs to be serviced. View your battery usage information An iPhone battery that’s at 70% health is pretty much unusable- so 70% is essentially 10%. When the battery health says 80%, it’s really more like 45-50% and you can feel it. So the takeaway is - the iOS battery health number is a lie. 80% battery health ain’t 20% less powerful than a new battery. Also the battery health number is gamed. 82% just means it holds 82% capacity compared to a new battery that apple wants to sell you. Depending how much you drive 82% of a full tank still gets you really far. Box2secure • 1 yr. ago. 😄alright i get you. saengjan • 1 yr. ago. 82% is pretty bad. Since I believe you might be already out of warranty, have it replaced now. All iPhones have a specification for the battery. For the XS Max that is 3174 milliampere-hours (MaH). So the battery monitor is calibrated for 100% at that value. But there are variations in manufacturing, so some batteries will have less capacity, and some will have more. Suppose your battery had, say, 3374 MaH capacity. I got my iphone 11 in December. My battery health is 100%. One thing I set up right away was "Optimized Battery Charging". I make an effort not to over charge, and I don't plug it in until it's down to 20%. They said it's best to keep your phone between 20 - 80%, If I leave it on the charger too long and it gets too high, I remove it as soon as However, with iPhone 11, 12, 13 running iOS 14.5 or later don't require calibration in order to improve battery life. However, this can help change the battery heath maximum capacity to its actual value, so I recommend this to people as it won't diminish iPhone battery lifespan. F0kW.