The size of Portable power bank

I have been on the Portable power bank size of doubt, mobile phone battery is about 2000 mAh, but Portable power bank is now generally style, is about the capacity of the 10000 mAh , that is in accordance with the proportion of view, a 10000 mAh Portable power bank, its volume should be equal to 5 of mobile phone battery volume, but now on the market of Portable power bank the volume, but more than 5 mobile phone battery,this problem I have thought for a long time, the volume of Portable power bank Is it right?Manufacturers deliberately do a lot, or that Portable power bank has special function, so the Portable power bank volume will need to make this big.

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