I'm trying to figure out what affects a power bank's overall performance. Specifically, how do capacity (mAh), output voltage, and supported fast-charging protocols interact? Also, what role do internal circuitry and battery chemistry play in safety and efficiency? Are there trade-offs between higher capacity and charging speed that users should be aware of? Any insights or guidelines on evaluating these aspects would be greatly appreciated.
What factors should be considered when choosing a power bank’s capacity and charging speed?
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I'm curious—when you go for a 20,000 mAh power bank, does the internal boost circuitry usually cap the fast-charge input at 5 V/3 A, or can you still push 9 V/2 A without overheating? Also, have you noticed any real-world efficiency differences between Li-Poly and Li-Ion cells at the same capacity?