It is normal for the battery power to drop from 97% to 94% overnight because any electronic product with a battery will slowly consume a certain amount of power even when it is turned off because the electronic product itself has a certain resistance. Even if the battery is taken out and stored separately, the lithium battery will slowly drain its power. If you have a mobile phone that has not been used for a long time at home, you will definitely not be able to turn it on when you take it out, because the battery is slowly used up. If the mobile phone is turned on, it will consume a certain amount of power even in pure standby mode. For example, the radio frequency antenna inside the mobile phone will search the surrounding base station signals at any time to ensure that the mobile phone is on the network in real-time. Only in this way can it answer calls or send and receive WeChat messages at any time. In addition, some apps that are resident in the background of the system will also start some functions such as message push in the background from time to time, resulting in a certain amount of power consumption. Therefore, it is normal for the battery of the smartphone to drop from 97% to 94% overnight.
However, the screenshot given by the subject shows that the “maximum capacity” of the iPhone’s battery health dropped from 97% to 94% overnight. This “maximum capacity” is not the current power of the phone, but the power that the phone can hold. We know that lithium batteries have a service life. As the mobile phone's use time increases, the battery life will gradually decrease. This life span is reflected in the "maximum capacity" in "battery health" on the iPhone. When buying a new iPhone, the maximum capacity is definitely 100%. As the usage time increases, the "maximum capacity" will gradually decrease, and it is irreversible. When the "maximum capacity" is reduced to 70%, it means that the battery life of the mobile phone may be more than half of the usual, and the battery needs to be replaced at this time. So is it normal for the "maximum capacity" of the iPhone battery to drop from 97% to 94%? This situation is actually quite common because the "maximum capacity" is just an estimate given by the system, not particularly accurate.
There are many factors that affect the "maximum capacity" value of the iPhone battery. In addition to natural consumption, in most cases, the user's bad charging habits will cause the battery to quickly wear out. For example, because the charging speed of the iPhone is too slow, many netizens like to plug in the charger all night. Although the iPhone has an overcharge protection function, if the charger is plugged in for a long time, the battery will also generate a certain amount of heat and cause loss. Moreover, the battery is fully charged for a long time will cause the internal voltage to be too high, and it will also affect the life. Therefore, users of iOS 13 and above are recommended to turn on the "optimize battery charging" function in the battery options, which allows the iPhone to learn the user's daily charging mode and delay charging to more than 80%, thereby slowing the aging of the battery. In addition, during the charging process, remember to charge while playing games, because a large amount of heat is generated inside the fuselage when playing games and charging, and the combination of the two will cause the fuselage to become too hot and greatly accelerate the aging of the battery. In general, the "maximum capacity" of the iPhone suddenly dropped from 97% to 94%, which is a normal range, but users should also pay attention to their usual charging habits. Don't overcharge or over-discharge the phone, and don't let the phone be overcharged or over-discharged. Charge in a high-temperature environment. In this way, the service life of the battery can be extended.