In an environment where there has been no major breakthrough in lithium
battery technology and new energy batteries have not yet been applied to
electronic products, battery life issues have always troubled the majority of
mobile phone users. The emergence of fast charging technology allows users to
use fragmented time to charge more power into their mobile phones. The battery
life problem can be solved from another aspect. However, many netizens still
mistakenly believe that fast charging chargers are interoperable. Today, the
author brings you two experiments: 1. To verify the compatibility of
fast-charging mobile phones/charging heads; 2. The speed performance of
non-original chargers for charging iPhone 6s.
Popularization of charging knowledge
1. The output voltage/current on the charger 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 goes through the ① constant current stage. At this time,
the actual voltage of the battery is lower than the charging voltage (mostly
4.3v). During the constant current charging process, the battery voltage
increases. When it increases to about 4.3v (the battery is approximately 85%
full), Enter ② constant voltage mode, the charging current gradually decreases,
charging is about to be completed, and then enter ③ trickle charging mode to
charge with pulse current to extend the battery life.
3. The larger the battery capacity, the greater the charging current it can
withstand, which is what we often call charging 0.5c, 1c. For example, a
3000mAh0.5c (rechargeable) battery can withstand a charging current of 1500ma,
which means it can withstand a current of 1.5a. With technological innovation,
the charging current value that lithium batteries can withstand is now
increasing, which greatly shortens the charging time in the constant current
stage.
4. The voltage output by the charging head will not be directly loaded to
the battery level. There will also be a secondary voltage reduction electrode
inside the mobile phone. Therefore, the high-voltage 9v and 12v fast charging
are only to increase the charging power, reduce heat loss during transmission
and avoid reaching the upper limit of the microUSB port current. It does not
mean that 9v and 12v are directly loaded on the two poles of the battery.
Experiment 1: Charging speed of iPhone 6s with different charging heads
Many people may remember that when their iPhone is charged using some
third-party charging heads or data cables, the phone will prompt "This cable or
accessory has not been certified, and the charging current will also be limited,
which greatly increases the charging time." It takes time. But now, even if we
use a non-original charging head, it seems that we rarely see the message "This
cable or accessory has not been certified yet." So the question is, even if
there is no relevant prompt now, will the charging speed be affected by using
non-original charging heads and original charging heads to charge the iPhone?
Below we verify it through experiments.
Testing session:
Test mobile phone: iPhone6s (Hong Kong version, iOS9.3.1), charging head:
original iPhone, plugboard with USB port, third-party charging head.
Test method: Use a USB voltage/current detector for real-time monitoring of
charging, and monitor the voltage/current values at 10%, 50%, and 95% for 6
seconds (the specific power level has a slight deviation). (The same mobile
phone has a certain demand for input voltage/current at the same remaining
power, so as long as the voltage/current values read at three times are similar
(the power is basically the same), it can be considered that the overall
charging time is not much different. )
Test Data
The test results show that during the two periods of the test (fast
charging stage/trickle charging stage), the output power of a third-party
charger is basically the same as that of the original iPhone charger. At this
time, the charging speed is equivalent, while the plug-in board with USB output
is not. When the output voltage is relatively large, the output power is also
ahead of the other two. Therefore, the charging speed ranking (estimate) 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.
The author used 5 original chargers from different brands + 2 plug-in
boards with USB output for testing (the phone was 50% charged) and found that
the output voltage was basically slightly greater than 5v (some with higher line
compensation can reach 5.3v. And if there is no line compensation, it is lower
than 5v), and the current is also about 1a. Therefore, using some non-original
charging heads to charge the iPhone will indeed be faster than the original
charging heads. Of course, counterfeit/low-quality chargers are another
story.
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