I'm trying to understand what influences the overall performance of a powerbank. 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? I'd appreciate any insights or guidelines on evaluating these aspects.
What factors should be considered when picking a powerbank’s capacity and charging speed?
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I'm curious—when you go for a 20 000 mAh powerbank, 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?