How to increase my battery health
My battery health was 91% , today I updated my phone and it became 88% I don’t know why , could you please explain to me , because it upsets me
iPhone 11 Pro Max, iOS 14
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How long has it been since the phone was new? You can’t increase battery health. Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles” ( some will be a little more, others a little less). As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.
When battery health reaches 80% (or if you see a message saying the battery is degraded) the battery should be replaced.