using xiaomi 5200mah

surprisingly can charge my s3 2100mah battery 2 times full..

but then the battery on phone depletes very quickly too compared to using wall socket to charge..

That's the problem today. Charging with low quality fake powerbank could be dangerous.

Is reputable brand like sanyo, panasonic, philips or samsung powerbank too expesive that people go for this fake powerbank? Those may have low mAh but it may charge the same mAh as bigger (claimed)20000 powerbank.

Hi

Good stuff you have here

Just wondering x-treme

i see people quoting the xx time charging the phone
but afaik the internal battery is also Li-type
so it runs on 3.7v instead of 5v

so a xiaomi 10k battery (by your calculations)
7k mAh @ 5V
and a Xiaomi Mi3 phone @ 3K mAh (3.7v)
have ~2.2K @ 5V

so it should be 7/2 = 3 times

but i see people here calculate by taking the powrbank capacity @ 5V and dividing with phone battery capacity @ 3.7v

a bit here