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How Many MAh Should A Good Power Bank Have?

Simply put, depends on your needs. Most probably, you're looking to store power for your phone. The average phone battery is nowadays around 2200mAh, which means that a 5000mAh power bank could roughly charge it twice (accounting for energy losses, see:Power Banks: How many times can a 5000mAh rated power bank charge an iPhone 6?).

But, if you're the kind of person that travels a lot or perhaps does not have a wall-plug available at least once every 24 hours, then probably a bigger (~ 8000mAh) would be a good supply for at least 2 days worth of constant use.