The core of Qualcomm's QC2.0 technology is to reduce the charging current by increasing the charging voltage, thereby reducing the power consumption of the charging line, that is, the idea of reducing consumption. It requires a corresponding voltage reduction circuit on the mobile phone side. The biggest advantage of QC2.0 is that it has good technical compatibility and inheritance. The external interfaces are all universal USB standards, so users no longer have to purchase the required charging cables separately. This practicality coincides with Xiaomi mobile phones. When the QC2.0 charger is used to charge mobile phones without fast charging functions, it can still be charged in the normal way, which is equivalent to killing two birds with one stone. The disadvantage is that the circuit on the mobile phone side will generate a lot of heat and the speed will be relatively slow.

　　PumpExpressPlus, launched by MediaTek this year, can bypass the charging circuit inside the phone and go directly to the battery, thereby preventing the phone from getting hot during charging. It also has built-in more than 20 safety-related device protection mechanisms, such as preventing devices and chargers from overheating. Its technical feature is to allow the charger to determine the initial charging voltage based on the current. However, for users, the performance of Meizu MX5 can also prove that the biggest feature of MTK's PEP is to reduce the heat of the phone and battery.

　　Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%

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　　OPPO's VOOC technology is characterized by adjustments to every aspect of charging and five layers of safety protection. OPPO has applied for a patent for its flash charging technology. There are two main points. One is to use a larger current to charge the phone when the battery is low, so the voltage is gradually reduced and the current is gradually reduced. It can be understood as segmented charging to avoid long-term large-current charging that makes the mobile phone battery hot. The second point is the multi-line setting of the charging cable and battery. The general charging cable has 4 or 5 pins, while the VOOC has 7 pins. The number of battery contacts has naturally increased to 8, reducing the line load. Another great feature is that it charges quickly. Its shortcoming is obvious, that is, it is difficult to be compatible with other Android phones. Whether it is an adapter, charging cable, battery or mobile phone side circuit, it is its own technology. This will obviously affect the user experience.

　　Comparing the charging speeds of these three technologies is roughly: VOOC>PEP>QC2.0

　　Will fast charging technology affect battery life?

　　This item is probably the issue that most users are most concerned about. No matter how fanciful the developer’s introduction is, what users are most concerned about is still the impact on their mobile phones, especially in terms of battery life. The mobile phone I am using is equipped with QC2.0, so I am very concerned about this issue.

　　First of all, let’s make a conclusion. Today’s fast charging technology has an impact on battery life, but don’t worry too much, because you may change your phone before the battery life is over...

　　Then let’s analyze why, most mobile phone batteries on the market are still lithium batteries. Today's fast charging technology, whether it is QC2.0, PEP or VOOC, cannot completely avoid the phenomenon of heating during charging. The difference is only mild or severe. For lithium batteries, in addition to normal charging and discharging, working at high temperatures also requires It is bound to be accompanied by some side reactions, such as electrolyte decomposition, deposits on the electrodes, etc. These have a large or small impact on battery life. The maximum capacity of the battery and the display of battery power will be affected as a result of these side reactions. As for the size of the impact, it naturally varies with the degree of fever.

　　However, the safety of fast charging technology can be guaranteed. First, as mentioned at the beginning, the current size is not very high compared to the technology. Second, when developers develop fast charging technology, they will also inspect the inside of the charger and the inside of the mobile phone. Even the inside of the battery is adjusted accordingly to adapt to larger currents, and different protection measures are also set up to ensure safety, so you can rest assured about this. Of course, the premise is that the user uses the original charger and battery normally.

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