Shulou(Shulou.com)11/24 Report--

CTOnews.com, March 2 (Xinhua)-- Apple today updated the Apple Watch support documentation, which mentions that the watchOS 9.4 being tested will recalibrate the 44mm Apple Watch Series 6 battery to more accurately estimate the maximum battery capacity.

Apple recalibrated Apple Watch Series 4 and Apple Watch Series 5 batteries in the watchOS 9 update, and the process is now being extended to 44mm Apple Watch Series 6.

Graphic source Pexels (CTOnews.com Science Popularization: all rechargeable batteries are consumables, and the performance of the battery decreases as the battery chemistry ages, so the charge needs to be constantly calibrated to assess life / health).

As the chemical age of lithium-ion batteries increases, the amount of electricity that can be stored in the battery decreases, resulting in a reduction in the time for the device to be used before it needs to be recharged. The amount of electricity that the battery can store can be called the maximum capacity of the battery, which is relative to the new battery.

In addition, the ability of the battery to provide maximum instantaneous performance (that is, "peak power") may also be weakened. In order for the Apple Watch to work properly, the electronic components must be able to make use of the instantaneous power of the battery, and one of the factors affecting the instantaneous power output is the impedance of the battery. Batteries with high impedance may not provide enough power for the system.

When the chemical age of the battery is too old, the impedance may increase. In the low charge state and low temperature environment, the impedance of the battery will increase temporarily, coupled with the higher chemical age, the increase of impedance will be more obvious. These are the chemical properties of batteries, as are all lithium-ion batteries in the industry.

When power is obtained from a battery with high impedance, the voltage of the battery drops sharply. The normal operation of electronic components has certain requirements for the lowest voltage. This includes the internal storage of the equipment, the power circuit and the battery itself.

Apple said the power management system determines the power supply capacity of the battery and also manages the load to keep the device running. If the power management system cannot support the operation of the device at full capacity, the system will shut down to protect these electronic components. Although the device is not deliberately shut down, users may be surprised by this.

Apple has built-in software and hardware systems in the Apple Watch Series 5 and newer models to help reduce the performance effects that may be noticed in some cases, such as low battery power, high peak power, or battery chemical aging. The system runs automatically around the clock to provide the best performance possible.

In watchOS 7 and later, Apple Watch will learn your daily charging habits to extend battery life. This feature, called "optimizing battery charging", is designed to reduce battery loss and extend battery life by shortening the time the Apple Watch is fully charged.

In addition, the "low battery mode" in watchOS 9 also reduces the power consumption of the Apple Watch by turning off or changing some features, thereby extending battery life.

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