What is the reason why the phone is sometimes slow and sometimes fast

The voltage is unstable. Change the charger.

To be genuine.

The problem of fast and slow charging speed of mobile phones is often encountered, and the charging speed will not be accelerated when the mobile phone is charged, but it is possible to slow down the charging speed due to external factors, and the reasons are analyzed below.

Reason analysis 1:The charging specifications of the power adapter affect the charging.

The standard charger of most brand mobile phones is standard 5V, but manufacturers generally equip different output currents according to the battery capacity. Someone once compared the difference between a 2A charger and a 2-lane charger if the voltage is the same—every time the current is doubled, the amount of charge doubled in the same amount of time. Therefore, when charging the iPad with the charger of the iPhone with a maximum output current of only 1A and charging the iPad with the original charger of 2A, the charging time of the former is twice that of the latter under theoretical conditions.

Reason analysis 2: Inferior data cable slows down the charging time".

Many low-cost data cables look thick, but the core inside them is very thin, or pure copper has been replaced by aluminum wire. In addition, there may be hidden dangers in the contact material and welding of inferior data cable connectors, and the above problems will lead to an increase in resistance, the standard data line resistance should be ohms, while the inferior wire may reach 3 6 ohms, and the charging efficiency will naturally decrease by 6 to 12 times.

Reason analysis 3: weather factors.

Mobile phones often experience problems that cannot be charged during the cold winter season, which may not be a problem with the phone, but because the temperature is too low. Because most of the lithium batteries used in smart phones are set up with a low-temperature protection mechanism, the temperature is too low, resulting in the deposition of lithium metal in the lithium battery, which no longer reacts with the substance, which will lead to a short circuit inside the battery, which will not be able to charge or charge very slowly. This problem can also arise when the temperature is too high.

This problem may be related to temperature, as well as contact problems.

1. Use the standard charger and data cable to charge the mobile phone;

2. Try to keep the phone at a low initial charging temperature, for example, if the phone is in working state before charging, you can end all the programs in the background, turn off the screen for more than 5 minutes, and wait for the phone to cool down before starting charging;

3. End the background application when charging, and turn off the screen;

4. Try to avoid using the mobile phone while charging, the use of the mobile phone during the charging process will consume the output energy of the charger, increase the heat of the mobile phone, and affect the charging speed;

5. When charging, place the mobile phone on an object with good heat dissipation (such as a desktop) or a well-ventilated place (such as a place where a fan or air conditioner can blow); Avoid placing on objects that are not easy to dissipate heat (e.g. sofas, quilts, blankets);

6. Do not use overly thick metal protective cases, these protective cases will affect the heat dissipation of the mobile phone, thus affecting the charging speed;

7. Bring your mobile phone, original charger set and purchase voucher to the customer service center for testing and processing, customer service center address: enter vivo official website vivo**app - my - service outlets or vivo official website web version - bottom - service support - service outlets - select provinces and cities to query the address of the customer service center. It is recommended to contact ** in advance before going to avoid empty running, plan the itinerary reasonably, and travel safely.

The mobile phone is charging very slowly, either the charger or power cord is faulty, or the mobile phone battery is aging and can no longer be charged.