I tend to think of electricity like water, like it flows to the object with lower charge(lower water level). But how can I charge my phone off a battery bank until the bank is dead, and the phone doesn’t start charging the battery bank? How do the devices force electricity beyond some “equilibrium” that would occur in the analogy of two tanks of water with different levels are connected then level out to the same water level? Hope that makes sense. Thanks!
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If you had just 2 batteries, it could behave like you described… (Assuming they have same internal resistance)
The trick is bunch of fancy electronic…
Lithium batteries usually have 3.7V. usb has 5V by default and 9,12 or more with fast charging…
This separates the two batteries and makes it work
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