The charging process of smart phones is mainly completed by the collaboration of three parts, namely: power adapter, data line and mobile phone. The charging speed is affected by many factors . internal factors include the phone itself , the power adapter , and data line . external factors include the weather , the way the user uses the phone and so on , all affect the charging rate of the phone . mobile phones with large battery capacity take longer to charge .
We should learn how to calculate the charging time at first before discuss the phone charging speed . the charging time can be calculated by a simple formula: charging time = coefficient (generally greater than 1) * battery capacity (mAh)/charging current (mA). When the charging current is constant, the larger the battery capacity is, the longer the charging time will be. When the battery capacity is fixed, the higher the charging current, the shorter the charging time.
So , you have to charge your device for a longer period of time when the current remains unchanged , as the manufacturer increases the phone capacity to meet the needs of people using mobile phones for a long time .
In addition ,in practical work , the current is determined by the connect load (the phone) . the charger can provide as much current as the phone needs , as long as it is within its power range . the charger will always output the maximum current if the phone needs more current than the charger can provide . So with the same battery capacity, the more current the phone can carry, the faster the charging time.
The charging specification of the power adapter affects the charging speed
Most phones now come with a standard 5V charger, but manufacturers generally have different output currents depending on the battery capacity.
Someone once said that, assuming the same voltage, the difference between the 0.5A, 1A and 2A chargers is like a single-lane, two-lane and four-lane highway – every time the current is doubled, the charge is also charged in the same time. Will double. Therefore, when the iPad is charged with a charger with a maximum output current of only 1A and the iPad is charged with a 2A original charger, the charging time of the former is 2.1 times that of the latter under theoretical conditions.
So , when charging the mobile phone, in order to ensure that the charging speed of the mobile phone is fast enough, you should try to choose the original charger or other brand charger whose output current is not lower than the original standard.
Inferior data lines are the "murderers" to slow down charging time
It is difficult for the average person to distinguish the difference between the data lines from the appearance. Therefore, if the interfaces are consistent, mixing is like a common meal, but the number of currents provided in different data lines may be different.
Many of the low price data lines look thick, but the internal core is very thin, or from pure copper to aluminum wire. In addition, there may be hidden dangers in the contact material and welding of the poor quality data line connector, and the above problems will lead to the increase of resistance. The standard data line resistance should be 0.5 ohm, while the poor quality line may reach 3 ~ 6 ohm, and the charging efficiency will naturally decrease by 6 to 12 times.
Weather factors that are easily overlooked
Many people have such experience, mobile phone in the winter season often encounter the problem of not charging, this may not be a mobile phone problem, but because the temperature is too low. Because most of the lithium batteries used in smart phones are equipped with low temperature protection mechanism, the low temperature will lead to the deposition of lithium metal in the lithium battery, and no longer have chemical reaction with the material, which will lead to the short circuit inside the battery, at this time, it will be unable to charge or the charging speed will be very slow. This problem also occurs when the temperature is too high.
Apple claims that the iPhone is most efficient at room temperature of 22 ° C. The same is true for android phones with lithium-ion batteries. When temperature is too low, we need to transfer the equipment to a warmer climate, over temperature protection for lithium battery temperature threshold (tablet, laptop is usually 5 ℃, such as mobile phones generally 0 ℃ or so) can be normal charged If the phone gets hot during charging, remove the case or place it on a cool desktop to cool it down and increase the charging speed. Therefore, temperature is a relatively important external factor affecting the charging of mobile phones, and the appropriate temperature can help improve the charging speed.
The right charging techniques can help increase the charging rate
When the lithium battery is very low, it will start the lithium battery protection. At this time, the mobile phone cannot be started, and there will be no response at the initial charging stage, and the charging time will also become longer. The charged phone needs to wait a long time to wake up the battery and turn off the protection function. So try not to wait until you run out of juice to charge.
As we all know, mobile phone boot, a variety of programs have been running, will consume more power, will naturally drag the "charging rate" hind leg. So when charging, try to turn off some apps and turn off the phone screen. Of course, if you can shut down or adjust to "flight mode", you can save more power, and the charging speed will be faster, but for most people, it is not realistic to completely cut off the connection with the outside world for charging.
In addition, some friends like to charge through the computer's USB interface, which takes longer to charge than the method of charging on the socket. Under normal circumstances, the maximum output current of the front USB port of the computer is only 0.5A, and the charging speed is very slow. If you have to use the computer USB port to charge, you can use the computer's rear USB port, because its current is stable than the front port, the charging speed is relatively faster.