As we know,a lot kind of powerbank sell in the market now,what we really care about is how much power the powerbank can charge our devices,I will introduce some simple way to check the real capacity.

1,For example: there is a powerbank named A,it's said it has 10000mAh,and need charge 7hours from 0-100%,the input is 5V 1A(1A=1000mAh),do u know this is fake capacity or not?

I will post the answer tomorrow,who answer the right way and explain how have chance to become GOODaaa VIP member.

The Answer is this A powerbank is fake capacity.
Input power is 1000mAh/hours(1A),Need charge 7hours means charge in 1000*7=7000mAh.but according average data, there is around 25% power will lost in transfer into powerbank(75% power charge in).so the real capacity is around 7000*75%=5250mAh.

This is cool

Jimmyhetao: The Answer is this A powerbank is fake capacity.
Input power is 1000mAh/hours(1A),Need charge 7hours means charge in 1000*7=7000mAh.but according average data, there is around 25% power will lost in transfer into powerbank(75% power charge in).so the real capacity is around 7000*75%=5250mAh.

Thanks for this info bro, I really commend your effort to educating us.
But i don't understand the maths you did. Please, redo the maths but do it much more vividly and with concise steps.
Thanks.

Interesting ... Front page

lomomike:

Thanks for this info bro, I really commend your effort to educating us.
But i don't understand the maths you did. Please, redo the maths but do it much more vividly and with concise steps.
Thanks.

Okay,My friend.
1,Input means after you run out the power of your powerbank,now you need charge your powerbank from 0-100%(so tomorrow you can carry it with your smartphone)
The input=1A, means your can put 1000mAh/hour in your power bank.but becuase of transfer lost(like you carry water from 1 bottle to another,there will be some water lost),the averager transfer lost is around 25-30%. so means charge 700-750mAh/hour into your powerbank.
If your friends have Romoss or XiaoMi 10400mAh(real one,not fake),and the USB power adapter is 1A,the charge time from 0-100% is around 13 hours.why?
Becuase 10400mAh/750mAh=13.86 hours.You can confirm what I say by asking your friend.

Now If Some people said he sell 12000mAh power bank,with 1A input,but only need 7hours.you can caculate it by yourself like following:
12000mAh/750mAh=16hours. Real capacity 12000mAh power bank need 16hours charge from 0-100%,but when you test,you find it only need 7hours.this is the fake capactiy.

Anything confuse,keep asking,we will answer everything we know.thanks.

Davidbanky: Interesting ... Front page

Yes,simple way to know if it fake capactity or not.

Fine.

I commend you greatly for this info. Thanks!

Jimmyhetao: The Answer is this A powerbank is fake capacity.
Input power is 1000mAh/hours(1A),Need charge 7hours means charge in 1000*7=7000mAh.but according average data, there is around 25% power will lost in transfer into powerbank(75% power charge in).so the real capacity is around 7000*75%=5250mAh.

I commend you greatly for this info. Thanks!

For proven quality power banks that re testified to be genuine and last longer. check this thread..... https://www.nairaland.com/1809260/quality-lumsingtm-romoss-sense-4tm

slye: For proven quality power banks that re testified to be genuine check this thread..... https://www.nairaland.com/1809260/quality-lumsingtm-romoss-sense-4tm

Yes,Romoss is good quality,I like ROMOSS, but ROMOSS need more time to charge in.like 13 hours with normal 1A USB power adapter.and ROMOSS don't has LED light.

You can go to this post to check GOODaaa03 PowerBank.2X faster charge(6.7hours charge from 0-100%),With powerful LED.

https://www.nairaland.com/1844097/how-choose-good-powerbank-digital

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more power,more fun

Raise any questions

My power bank does not have a brand name. Its just "power bank" pls is it fake?

bloglover:
My power bank does not have a brand name. Its just "power bank" pls is it fake?

Your power bank is super fake... Read a detailed info on knowing fake power banks.@my signature

dastranger:


Your power bank is super fake... Read a detailed info on knowing fake power banks.@my signature

This is what my power bank looks like. It has a wallet pouch, 20000Mah with the brand name as power bank.

bloglover:

This is what my power bank looks like. It has a wallet pouch, 20000Mah with the brand name as power bank.

Oops... I think I ve seen that bank somewhere... any banks with no brand, with absurd ratings like 20000mah, 30000mah re mostly farce, just open my thread@signature and get more insights on power banks

For genuine Romoss power bank

visit jiji.com/sellerpage-620052 or konga.com/sol-technologies

Jimmyhetao:


Okay,My friend.
1,Input means after you run out the power of your powerbank,now you need charge your powerbank from 0-100%(so tomorrow you can carry it with your smartphone)
The input=1A, means your can put 1000mAh/hour in your power bank.but becuase of transfer lost(like you carry water from 1 bottle to another,there will be some water lost),the averager transfer lost is around 25-30%. so means charge 700-750mAh/hour into your powerbank.
If your friends have Romoss or XiaoMi 10400mAh(real one,not fake),and the USB power adapter is 1A,the charge time from 0-100% is around 13 hours.why?
Becuase 10400mAh/750mAh=13.86 hours.You can confirm what I say by asking your friend.

Now If Some people said he sell 12000mAh power bank,with 1A input,but only need 7hours.you can caculate it by yourself like following:
12000mAh/750mAh=16hours. Real capacity 12000mAh power bank need 16hours charge from 0-100%,but when you test,you find it only need 7hours.this is the fake capactiy.

Anything confuse,keep asking,we will answer everything we know.thanks.

With this calculation, so you mind shedding more light on a 20000mah powerbank that accepts 18w input, how do we do the calculations?