Worst metric Apple brought to iPhone. I forget it’s there because my life doesn’t revolve around my battery percentage. Use your phone how you want to! 99% of batteries have no issue and your battery health 99% of the time is tied to how you use it. Logically, the more you use your phone, the more battery it consumes. You will start to see CPU throttling or random shutdown below that point. At 90% - 100% is good battery health for used iPhone. anything near 80% will require replacement. Depends what iPhone are you looking to buy depends on the cost and if you want to repair it yourself. Hi guys in this video I’m gonna tell you what should be the minimum battery health level of an second hand iPhone that you can buy in market so that you can Battery health before bringing phone to apple to pay to replace the battery was 95%. The reason I brought it in was NOT due to the reduced battery life, it was due to the phone shutting off when the battery percentage was less than about 35%. I did have to convince them to replace the battery but a new battery resolved the issue. 4. This really is a separate issue from battery health, except indirectly (may drain battery faster resulting in low battery). This is only relevant for people with apps that suck their battery in the background. Of course, for people who don't know what their apps are doing, this is decent advice. Apple itself advises that you keep a battery charged between 20% and 80% for optimum performance. It’s why it warns you when your battery dips to 20% and why it introduced optimized charging 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. 82% is pretty bad. Since I believe you might be already out of warranty, have it replaced now. Yeah, still your call. You can check your Battery Health by going Settings > Battery > Battery Health. As far as Apple is concerned, anything over 80 percent is good. Also, according to Apple, like other iPhones, the iPhone 11 Pro Max’s battery should be good for at least 500 recharge cycles. Consider a concrete example. Imagine your battery had a brand-new capacity of 3000 mAh. Today, your battery holds 2880 mAh. Your phone reports this as “96% battery health” because your battery can now only hold 96 percent of the original capacity. Supposedly, this number approximates battery degradation and therefore battery status. 75% health - is actually dead battery, you have to replace it. memoirsx • 2 yr. ago. I used to have an Xs with 100% battery health and 64gb storage. Swapped it with 85% battery and 256gb storage. I go out of the house with it charged to 100%, it can lasts a day without video streaming and just using basic features and some social media. SndhYb.