For those who play electronics, the 18650 lithium battery is very familiar! As for the question of charging the 18650 battery, it is not cost-effective to buy a special charger just to charge it, and sometimes the battery cannot be removed for charging during some things!
We all know that the rated voltage of 18650 battery is 3.7V and the charging cut-off voltage is 4.2V. The output voltage of chargers that we usually use for mobile phones is 5V, which cannot charge 18650 batteries directly (most chargers now are fast charging and the output voltage can be 9V/12V. It does not is issued only when the fast charging protocol handshake is successful).
When the battery is first connected, there may be no voltage output between OUT+ and OUT -. At this time, the protection circuition can be activated by charging with a voltage of 5 V. The battery will be short-circuited. of B+ and B- If you turn it on then connect it, you also need to charge it to activate the protection circuit.
The battery capacities of Apple mobile phones are 4352 mAh, 3095 mAh and 2406 mAh respectively.
Of course, the high-end version of the iPhone 13 Pro Max should have a maximum battery capacity of 4,352 mAh. For comparison, the iPhone 12 Pro Max has a 3,687 mAh battery. Second, the iPhone 13 and iPhone 13 Pro will use 3,095 mAh batteries, while the iPhone 13 mini will have a built-in 2,406 mAh battery. It is currently reported that lithium batteries with model numbers A2653, A2656 and A2660 have now passed China's mandatory 3C certification.
Precautions for using Apple cell phone batteries.
1. Maximum capacitymale is easy to understand. This is actually a percentage setting of the current battery loss. If the battery status is 100%, it means that you can currently use 100% of the battery capacity. . Take the iPhone XS as an example. 100% means the 2658 mAh battery can be fully used. After lowering it, only the currently displayed battery capacity percentage can be used.
2. In addition to reducing the maximum capacity which will affect the phone's battery life, the Apple phone will reduce the frequency of the phone when the maximum battery capacity drops below 80%. i.e. if the maximum battery capacity is 70%, the phone will automatically enable the performance management feature. In other words, if the maximum battery capacity is less than 70%, it means that the mobile phone battery needs to be replaced.placed.