How can a battery bank at 10% charge a phone at 90%

Question

How can a battery bank at 10% charge a phone at 90%

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Answer 1

Electric charge in lithium ion batteries is often compared to pressure, as such, how can it flow from a low pressure cell to a “higher pressure” one? This might sound dumb, but this thought just popped into my mind.

I know there is battery management boards, with controllers to ensure battery health, but principally, how can it flow from a lower voltage cell to a higher voltage battery?