Is the lithium battery compatible with various fast charging?
In the environment where lithium battery technology has not made a big breakthrough and new energy batteries have not yet been applied to electronic products, the battery life problem has been plaguing the majority of mobile phone users. The emergence of fast charging technology allows users to charge more power to the phone in fractional time. The battery life problem can be solved from another aspect. However, there are still many netizens who mistakenly believe that fast charging heads can be used interchangeably. Today, the author brings 2 experiments for everyone: 1. Verify the compatibility of the fast charge mobile phone/charger; 2. The speed performance of the non-original charger for the iPhone 6s.
Popularization of charging knowledge
1. The output voltage/current on the charging head is only the maximum allowable value, not the actual output value. The actual output value depends on the specific needs of the mobile phone/mobile device.
2. Charging first passes through a constant current phase. At this time, the actual battery voltage is lower than the charging voltage (mostly 4.3v). During the constant current charging process, the battery voltage increases, and when it is raised to about 4.3v (the battery power is about 85% full), Entering the 2 constant voltage mode, the charging current is gradually reduced, the charging is almost completed, and then enters the 3 trickle charging mode to charge the pulse current to extend the battery life.
3. The larger the battery capacity, the greater the charge current that can be withstand, which is what we often call charging 0.5c, 1c. For a chestnut, a 3000mAh 0.5c (charged) battery can withstand a charging current of 1500ma, which is 1.5a. With the innovation of technology, the current charging current value of lithium battery is increasing, which greatly shortens the charging time in the constant current phase.
4. The voltage output from the charging head will not be directly loaded into the battery level, and there will be a secondary step-down electrode inside the phone. Therefore, the high-voltage 9v, 12v of fast charge is only to improve the charging power, reduce the heat loss during transmission and avoid reaching the microUSB port current limit. It is not that 9v and 12v are directly loaded on the battery poles.
Experiment 1: The speed of charging the iPhone 6s with different charging heads
Many people may remember that when the iPhone on their hands uses some third-party charging heads or data cables for charging, the phone will prompt â€œThis cable or accessory has not been certifiedâ€, and the charging current will be limited, which greatly increases the charging. The time required. But now, even if we are using a non-original charging head, it seems that we rarely see the "This cable or accessory has not been certified" prompt. Then the problem is, even if there is no relevant prompt now, using the non-original charging head and the original charging head to charge the iPhone, will the charging speed have an effect? Below we pass the experiment to certify.
Test mobile phone: iPhone 6s (Hong Kong version, iOS 9.3.1), charging head: iPhone original, plug-in board with USB port, third-party charging head.
Test method: Real-time monitoring of charging using USB voltage/current detector, and distinguishing the voltage/current value of monitoring 6s at 10%, 50%, 95% three times (the specific power is slightly deviated). (The same mobile phone has a certain demand for input voltage/current at the same remaining power. Therefore, as long as the voltage/current values â€‹â€‹read at three times are similar (the power is basically the same), the overall charging time can be considered to be small. )
The test results show that the third-party charger and the original charger of the iPhone have the same output power during the two periods of the test (fast charging phase/turbulent charging phase), at this time the charging speed is equivalent, and the board with USB output is When the output voltage is relatively large, the output power is also ahead of the other two. Therefore, the charging speed ranking (estimated) is: socket with USB "iPhone original charger = third-party charger (from fast to slow). Of course, different third-party chargers/sockets with USB have different output effects.
I used 5 different brands of original chargers + 2 plug-in boards with USB output for testing (50% of the phone), and found that the output voltage is slightly larger than 5v (some lines can be higher to 5.3v, There is no line compensation below 5v), and the current is also around 1a. So using some non-original charging heads to charge the iPhone will indeed be faster than the original charging head. Of course, the cottage / poor quality charger will be said.
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