We all know that lithium batteries have no memory effect, so excessive discharge will lead to premature aging of your mobile phone battery. But now it has reached the era of lithium battery, which has completely different characteristics from nickel-hydrogen battery. So for iPhone, try not to use less than 20% battery, otherwise it will only accelerate its aging.
Second, there is no need to pull the wire in a hurry. The second wrong charging concept is "If the charging reaches 100%, it should be unplugged immediately". Third, keep the battery healthy. Keep the battery charge below 20% once a month to keep the battery healthy. Therefore, the best way to maintain the battery is to recharge it after it is less than 20% 1-2 times a month, which can maintain the health of the battery well.