How to test Power Bank  


We have tested 18 current Power Banks: The best is the compact EasyAcc PB6400MT2. The small external mobile phone battery has enough capacity to fully charge a smartphone twice and also one of the cheapest battery packs in the test field.

How to test Power Bank

Power Banks are the solution of the biggest problem of the mobile devices: the limited battery of smartphones and tablets. So you may really need a battery pack with small size but it can charge you device 2-3 times.

How to test Power Bank

The ABC of Battery Physics

  • How many times can I charge my smartphone with a battery pack?

How We Tested

Test Winner: EasyAcc PB6400MT2

  • Small and mobile: 6400 mAh
  • Medium size: 15,000 mAh
  • Maximum Power: 20,000 mAh

Alternatives: What else is there?

  • Power Banks to 10,000 mAh
  • Power Banks to 20,000 mAh
  • More than 20,000 mAh


 How to test Power Bank     

Depending on the battery capacity and the size of the cell phone batteries of emergency power is sufficient for one or more loads. Because the numerous manufacturers, which now abound on this market, offering Power Banks in many different sizes: from modest 3,000 to 20,000 proud mAh (mAh) and more. The capacity increases with the increasing dimensions and weight of the devices – and usually also the price.

 How to test Power Bank

The ABC of Battery Physics


To determine the capacity of a battery that is in practice not so easy. It is, for example, on the ambient temperature dependent – in cold weather a battery will provide far less power than at room temperature. We all know the problem is that batteries with the life lose continuously at capacity. And even when the power bank is charging and discharging itself, it will lost power because the quality of the USB cable also plays a major role. The amount of energy you put into it in a battery, the output capacity will never be the same.

All these uncertainties make many manufacturers exploit and exaggerate wildly with their information about the capacity of its battery pack – after the slogan: Can anyway not measure it exactly, especially with no-name manufacturers.

It has become customary to indicate the capacity of batteries in mAh. It involves actually a unit that provides little information about the actual capacity of a battery.

Much more meaningful than the mAh is the unit watt-hour (Wh), which stands for the electrical work and the amount of energy. In this unit flows next to the amperage that is the electrical voltage in Volt a, with the Power Bank battery is discharged. And this tension affects the usable capacity or rather the amount of energy that a smartphone actually be drawn from a battery pack.

Small sample calculation: A spare battery with 10.000 mAh provides 3.7 volts exactly the same electrical work like a battery with 1,000 mAh at 37 Volts – namely 37 Wh Specifying the milliamp hour (mAh), the watt-hour (Wh). However, 10,000 mAh certainly sounds more impressive than 37 Wh, which is why the manufacturers probably prefer this indication. After all, the supplier of almost all the battery packs tested by us give now to the capacity in mAh and Wh.

 How to test Power Bank

How many times can I charge my smartphone with a battery pack?

Most smartphone batteries have a capacity 2500-3500 mAh. However, they usually give off 3.8V, so strictly speaking the mAh of the battery pack cannot be directly compared with the smartphone. If you want to know how many times you can charge your smartphone with a battery pack, so you should rather look to the watt-hours.

Get the 11,000 mAh capacity Power Bank for an average 3,000 mAh and 3.8 volts smartphone. If a battery pack has a capacity of 20,000 mAh, you can almost 8 times fully charge it.

If you want more about capacity, electrical work and stress at Power Banks and smartphone battery know: a detailed explanation of the relationships there are at all-PC.

How to test Power Bank

How We Tested

We have researched extensively and finally ordered 18 current battery packs with good customer reviews. Besides, we have the additional batteries into three categories: less than 10,000 mAh, 10,000 to 20,000 mAh and over 20,000 mAh.

Since you cannot really rely on the manufacturer’s information on the capacity, we have all Power Banks even measured. We wanted to know how much kilowatt-hours of energy when complete discharging a battery pack actually flows and have the measured values ​​then compared to the manufacturer’s instructions.


Test Winner: EasyAcc PB6400MT2

According to our test that the manufacturer EasyAcc on top. In two out of three battery sizes, the models of EasyAcc delivered the best values.

How to test Power Bank

Power Bank Test: The three test winner

The three battery packs for EasyAcc size comparison.

Small and mobile: 6400 mAh

 How to test Power Bank

For most smart phone users who also go sometimes want to charge the battery when it is running, the model PB6400MT2’s interesting.

Want to get the code for the best Power Bank from the 18 power banks?

Click EasyAcc Hot Deals to get more deals.

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