I believe that many people have such a confusion, obviously to buy 10000 mAh Power Bank, but to the battery capacity of only 2500 mAh mobile phone charging, often filled with three times, no power on the mobile, and this in the end is how to back What about it? What are the manufacturers of virtual standard capacity or other reasons? Xiao Bian here to give you a wealth of knowledge about this area.
one. actual power
At present, the standard voltage of the commercially available Power Bank is generally maintained at about 3.7V. Therefore, the actual power of the 10000 mAh Power Bank is 3.7V × 10000mAh = 37000Wh, and the voltage of the mobile phone is 5V. According to the law of conservation of energy, Power Bank will output current boost to 5V state, the Power Bank capacitor is 37000Wh ÷ 5V = 7400mAh.
two. Conversion rate
Where the 7400 mA is not the final power of mobile phones, Power Bank for the mobile phone charging process, the circuit board boost and the operation of the security chip will lose part of the power, so the conversion rate of Power Bank is generally about 85% According to 85%, the actual output of the Power Bank supply is 7400mAh × 85% = 6290mAh.
three. Environmental impact and wire loss
And then the phone can get the power is not above the 6290mAh, because the air humidity and temperature and other environmental effects, Power Bank in the process of charging the phone will have a part of the loss, and the data itself in the process of transmission of energy will also Because the resistance and loss of a part of the power, so the final power to reach the phone will be lower than the 6290mAh.
four. Mobile phone itself buck
Mobile phone battery power and Power Bank is also maintained at about 3.7V, so the Power Bank transmission over the power will be in the mobile phone itself a buck treatment, the process will undoubtedly lose part of the power, which is why Many mobile phones in the charging time will be the cause of fever.
Fives. Phone running status
In addition to buck, the state of the phone during charging will also affect the actual number of times the Power Bank is charged. If the phone is in the process of charging, the phone is playing games, watching video, listening to music, watching novels and other high power consumption state, it will further affect the Power Bank for the actual number of mobile phone charging; if the phone is in the daily standby state, the actual The number of charges also have a certain impact. The ideal state is off the charge, but Xiao Bian believe that not many people will shut down charging it!
I believe we have seen here that Power Bank is not just a simple capacity to divide the capacity of the mobile phone, but many people will fall into the misunderstanding, since all Power Bank needs to go through the appeals process, then the greater the capacity of the higher conversion rate Of the Power Bank must be better and more practical bar.
Power Bank purchase errors
But in fact not the case, we do not say that Power Bank is only as a backup power emergency, Power Bank itself is a huge capacity to determine the charge is a long thing, and the corresponding capacity is greater, the time for its charge The longer, if in order to hurry only for the base part of the electricity, not as good as the choice of capacity is more appropriate. Say the conversion rate, in order to protect the safety of products and users, large manufacturers will be in the Power Bank circuit board to add some of the necessary security components, even sacrifice part of the conversion rate is also at the expense of the manufacturers in order to increase the product gimmicks, Often will remove the necessary protection without pieces, leaving security risks.
So Xiaobian here to remind you, buy Power Bank, please do not overestimate the conversion rate, in general, 85% is a reasonable level, too low can not guarantee the endurance, too high there may be security risks.