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It's very simple: a full charge means 5 * 20% charge or 4 * 25% charge or 2 * 50% charge or 10 * 10% charge or 2 * 20% + 2 * 30% charge.
It is only important that there is no deep discharge.
Using a PowerBank corresponds to a partial load and is completely unproblematic.
There were problems with the partial charging with nickel + X batteries
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