Maximum capacity of battery

Lithium batteries degrade over time, which is normal. Your battery health percentage is expected to decrease slightly to around 80% after two years of use, according to Apple.

99% is still pretty good and I would presume your phone is still relatively new. You can still charge your phone as normal but the battery might not last as long as usual over time

You can find more about batteries here

Every chemical battery degrades and looses capacity from the day it is manufactured. That is the inevitable physical property of chemical energy storage. So if you change your battery after a 1% drop in capacity, you’ll just need to do it again, and again, and again every few weeks or so.

Here is a longer answer. The same information as already posted, but perhaps easier to understand.

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.

The absolute best way to improve the life of your battery long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the night the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern.

No. Of course not!

You got a definitive answer from Ijustwanttolookattheforums and

recommended by the community specialists.