In theory, there is no problem, anyway, the current of the data line is one-way flow, can only flow from one side to the other side, as for what is the other side, it does not matter much. But in practice, there are problems:
1, as a charging treasure, its own battery capacity will generally be relatively large (at least larger than the mobile phone), 5000 MA or even 10,000 mA is normal, even if it is charged with an ordinary data cable, it will take a long time. And the power bank output current? Basically, it is mostly 2A, 1A or 1.5A, (the mobile phone input current has long been a mighty dash to the era of large current fast charging and flash charging), using this speed to charge the mobile phone is relatively slow, let alone the capacity of the mobile phone one or two times the charging treasure? (If you're talking about a small capacity like an apple watch charger, forget I said 23333)
To summarize: if you are suddenly open to imagination, well done! If you really plan to do so, or don't, too slow, not cost-effective, a charging bank with electricity is not a mobile phone with electricity, can not accompany you to play ah. If you want to test it just to pass the time, please let me know after the practice, thank you 23333
Look at the capacity of the two charging banks, if the two are the same size, it will certainly be dissatisfied, because the charging process will generate heat, both electrical energy into heat, according to the law of conservation of energy,
Power bank 1 capacity = Power bank 2 capacity
When charging Powerbank 1 to Powerbank 2, part of the electric energy is converted into heat energy, so the powerbank 2 cannot be full.
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In theory, yes, but the charging speed will be relatively slow.
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If the charging treasure is not used for a long time, it will automatically consume power during placement, so it needs to be taken out from time to time to charge. And it should be noted that the longer the storage time of the charging treasure, the greater the power consumption will be, and even if the battery of the charging treasure is better, it will consume about 50% of the power when fully charged for about half a year.
The biggest property of the charging bank is the storage of electricity. The role of the charging bank is to carry around, very small, very convenient to use, only need to carry a data cable, go where you can charge to where. However, if the charging bank is out of power, and you only have one charging bank, you will cycle it is impossible to fill. It will also leak electricity, so that it will not only be full, but also consume the power of the charging bank.
If you have two charging banks, one of the charging banks is out of power, you use the other charging bank to charge your charging bank without power, so that the charging bank without power will be full. And your other power bank will be drained. Why do you do that?
Isn't that unnecessary?
Yes, but there must be a charging bank with a relatively large capacity, a relatively small, and a large-capacity one can certainly be filled with a small-capacity one.