What is powerbank?
Powerbank is also known as battery charger. They are widely use by every person worldwide now with the rises of smartphones and tablet. Powerbank not only to charge smartphone and tablet power but also some other gadjets such as camera, PSP, and many more.
Then rise the question, HOW MANY TIMES POWERBAK CAN CHARGES?? I give the example using 5000mah powerbank.
How to calculate the conversion rate of power bank?
The formula is: battery capacity * 0.8 (about 20% loss) / mobile phone battery capacity = charging times (approximately)
For example, a mobile phone battery with my 1440 mAH, Power bank capacity 5000mAH,
The formula is: 5000mAH * 0.8 / 1440mAH = 2.7 (approximately)
Some mobile phone factory manufacture of the mobile phone battery, original battery also has the performance loss when charge, was estimated as 10%, if the loss of effective account
Such as the original phone battery performance loss:5000mAH*0.8*0.9/1440mAH=2.5 times(approximately);
To buy 5000mah powerbank without performance loss and power loss, click here.
Why people bought a mobile power bank 10000mAH can charge at less than 2 times?
This is because there are some bad guy who sell fake items. That why beware of this bad guy. They usually sell the item at lower price without any guarantee/waranty of product.
How the fake powerbank is?? click HERE to look at this bad guy item.
The best reviewed powerbank by customer says that PINENG POWERBANK is the best among them all.,
But unfortunately, there are also some bad guy who attemps to sell fake PINENG POWERBANK to our customer. So, here are the link to identify fake PINENG POWERBANK that should be avoided. Click here.
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click: NH Pineng Powerbank.
Narita Shopaholic 
Hi, i bought a 30000mAH powerbank, but can only charge my Samsung Galaxy S4 2X. This is the explanation from merchant. Pls comment.
//Quote//
How many times of charging is not derives by 30000/2100mah. According to the manufacturer, it is using 5v power output and input. So, as for all 30000mah power bank in the market, standard calculation: 30000/5v/2100= 2-3 times charging. As for iphone 4 as guideline, it can charge 3-4 times. This powerbank is a new technology using touch screen technology. Thus, manufacturer has compressed the power in the good of chipset in order to prolong the lifespan of the powerbank,
Frankly speaking, we couldn’t find any power bank that can charge up to 10X yet in the market (using iphone4 as guideline: 1450mAh), even in the China.
//Unquote//
How are we able to identify the correct mAh of a power bank? Some would claim the highest mAh but may deliver the lowest kind.
Any idea’s on this?
Thanks.