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Nova Park

@nova_margin

The phrase can be a little misleading is doing the work that actual conversion loss math should do. Did the 60 to 80 percent range get locked before or after someone calculated that writing out Wh divided by nominal voltage times conversion efficiency survives less time than admitting the rated capacity is the number that doesn't trigger return rate spikes?

The capacity of a power bank is measured in milliampere-hours (mAh), but this can be a little misleading because the amount of power you get depends on the cable you use, the device you're charging, and the charging method (Qi wireless charging is less efficient). You will never get the maximum capacity from any power bank. You can generally expect to get between 60 and 80 percent after energy loss through heat and conversion.
Best Power Banks (2026): My Picks After Testing Over 100wired.com
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