Ultimately, it's about safety and cost.
cost
First of all, it is recommended to check the price of the original mobile phone battery, the mobile phone battery 3000mAh of more than 1,000 yuan is basically about 150 yuan, and the individual mobile phone battery is even more than 300 yuan, and the mobile phone battery of 1,000 yuan is about 100, rarely less than 50. If the quality of the mobile phone battery is used as a charging treasure, then the price of the 10000mAh charging treasure is at least 200 yuan, but the fact is that the current 10000mAh charging treasure is generally between 50 and 80.
Charging treasure is not can not do fast charging, but more is to consider the fast charging of the hard demand for the battery and the high cost increase.
security
In the fast charge, there are two problems that need to be noted, one is fast charging and the other is fast charging.
Fast charging means increasing the current input at the rated voltage to speed up charging. The current charging current limit of the charging treasure is generally about 2a, mainly because the battery cell technology of the lithium battery is not particularly broken, so there is no better progress.
For the general cell, the current charging of more than 2a is dangerous, and the large current input is likely to lead to the overload heating of the cell, causing high temperature spontaneous combustion, explosion and other dangers.
Fast charging refers to the identification of chargers, circuits and other aspects are in line with the protection needs of the case, in the upper limit current size under the premise of increasing the charging voltage, that is, high-power charging, the premise is that once the battery has a problem, the charging data is abnormal immediately stop charging (now fast charging is more of a brand protection, small product overload protection), There is no big problem with fast charging of mobile phones, because the battery quality of mobile phones has gone up, and the battery cell of the charging bank is not as good as the quality.
High-power and high-voltage charging, for the charging treasure is more overcharge (overvoltage charging), which is very easy to cause the danger of fire, explosion and so on.
Now there are a lot of fast charging banks on the market, but basically work on the circuit, such as the cell is divided into multiple charging at the same time, so that the high power of the fast charge can be divided into voltage and current, and then charged with normal voltage and current