18650 battery Power bank - what capacity can it provide?

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ArminVanBuuren

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I found this wonderful devide:

**broken link removed**

Works on just 1 18650 battery. If I buy an 18650 Panasonic 3400 mAh, can I more than twice charge my 1500 mAh phone battery? Or the capacity is actually lower (dropping at certain cut-off discharge voltage)?

Thanks a lot.
 

lower because of loss in the boost circuit, charger, and cut-off voltage
 

Can you predict a theoretical possible capacity it can supply? Is it at least 2000 mAh?
 

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