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Question

power bank

by fyoung01 / February 19, 2016 7:43 PM PST

I have tried two branded power banks,purported to having 20,000mah power.
With the above two devices, with full charge, I am able to charge my Samsung A8 (having 3050mah battery ) only once and that too only partially! 20% to 65%
Please advise.

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All Answers

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Answer
I must be short about it here.
by R. Proffitt Forum moderator / February 20, 2016 8:22 AM PST
In reply to: power bank

If you charge one battery with another, the losses along the way are about 50% or sometimes worse. The 20,000 number is an ideal condition number and will decline over the next 300 cycles to about half. Because we can write volumes about batteries, I pause here.

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Answer
power bank
by jamesbrowb7488 / March 15, 2016 7:10 AM PDT
In reply to: power bank

Now a days power bank very need full everyone i really like these and very needful these one

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Answer
What Brand They Are? Are you sure both of them are not OEM?
by AdityaHere / April 8, 2016 12:48 AM PDT
In reply to: power bank

I highly doubt what R. Proffitt has mentioned regarding the device depltion thing. I suppose you have bought them recently and if so, the power banks should have worked find for at least one year. And it is highly unlikely that a true 20000 mAh power bank would yield only 1372.5 mAh (~ 6.68% only). you can find details about power bank capacity here. My suspect is both of the power banks you have are fake or counterfeit especially very few manufacturers came up with truly 20000 mAh power banks and Mi being one of them. Additionally there are lots of fake, OEM Mi power banks are prevailing in market. Be scrupulous while buying one.

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Answer
power bank power calculation
by niikyxia / June 4, 2016 6:54 AM PDT
In reply to: power bank

the voltage of the power bank is set to be 3.7V which equal to the battery of cell phone. so if you need to charge the phone, you need to raise its voltage to 5V, which means 20,000mah power can output 20000 x 3.7 / 5 = 14,800mah without any power lost while charging. in fact is it is impossible, the power lost ranges from 30% to 10% for a normal brand power bank, let's say 20% lost generally, and the last result is 14,800mah x 80%= 11,840mah can be used which can charge your A8 11,840 / 3050 = 3.8 times.
you can choose Filsen brand power bank which is very famous in China.

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