Practice Test How much capacity is actually there?

Practice Test How much capacity is actually there?

Ezreal stone feeling 10000mAh Dual USB External Battery Ultra Slim Portable Charger Power Bank for iPhone 6/6 plus / 5s / 5 / 4S / 4 Samsung Galaxy S 5/4/3/2 4/3/2/1 Note Google Nexus 5 / a 4/3 / S Glass Windows Smart Phone Android Tablets PCHeadset Bluetooth speaker MP3 MP4 Player (Electronics)

Customer Review

This Power Bank is ideal for traveling and outdoor activities such as long walks or Geocachingtouren, but of course also in the normal everyday life.

Who wants to the way time charge, will be able to use this spare battery well

Packing:
The Power Bank is delivered in an environmentally friendly and at the same time customer-friendly cardboard packaging. Here was thought along; the packaging is easy to open and unaided. It comes with the Power Bank, a USB charging cable and a user manual.

Processing:
My first impression convinces in optics: The black material looks very high and noble. The rough surface feels pleasant, everything is rounded, there are no sharp edges or corners. The case is processed very robust and stable. The USB ports are very accurately; The USB connector can be plugged easily and pull out again.

Weight and size:
With 243 g this power bank is not one of the lightweights, the high capacity, the high weight, however, is absolutely justified. Who wants it more easily, has to save at full capacity.
Low weight means counter stuff a small capacity
The external dimensions of about 14cm x 8cm x 2cm are perfectly fine. The Power Bank fits into any small bag or backpack enough space.

Operation and Instructions:
The operation is very simple and self-explanatory; without manual I was able to connect and charge my iPhone. Still, I've read through the German manual; this has a very comprehensive and clear. All necessary information is available in the form of small drawings.

On top of the case there are 4 blue LEDs on the side 1 button.
The 4 LEDs indicate the charge level in the form of a scale with 25% each. The switch is needed to start and stop the charging process.

Charging:
The included USB charging cable is about 30cm long; Thus, the power bank be charged if necessary. Charging is indicated by a number of blue LEDs on the top of the housing; when the battery is completely full charged, all 4 LEDs.

Note:
In order to charge the Power Bank, a USB charger is required. This should be able to deliver 2A output current, only the Power Bank is fully charged within 5-7 hours.. For chargers with less output current can take sometimes more than 20 hours to complete a full charge.

Capacity:
According to the manufacturer, the Power Bank has a capacity of 10000mAh.
On the subject of capacity, I have attached a detailed report at the end of this review.

Especially practical:
There are 2 USB Charging Ports, thus 2 devices can be charged simultaneously. I take this to charge my iPhone and my iPad at the same time.

Conclusion:
This Power Bank truly deserves its name right. The capacity is sufficient for diverse devices to charge several times. This allows the standby time, the move also without power, be significantly extended.

I am totally satisfied with this spare battery.

Strong buy recommendation

For the technique interested I have written a report on capacity:

Practice Test How much capacity is actually there?

The most important criterion when buying a Power Bank is the specified capacity. More capacity means more energy and hence a longer endurance. But what is actually behind the different capacity to the manufacturer? In order to shed some light into the darkness, I occupied myself more intensively with the issue and would like to pass my findings.

This Ezreal Power Bank has according to manufacturer a capacity of 10000mAh. This statement sounds good at first, but does not really help further since the battery rated voltage is not specified. The nominal battery voltage must not be confused with the 5V output voltage at the USB port. The battery rated voltage is 5V no means, but in most cases the built-in lithium-ion rechargeable has a nominal voltage of 3.7V.

First, the maximum available in the battery energy in the form of watt-hours (Wh) has to be calculated:

Battery Voltage * Capacity = Energy in Wh
* 3.7V 10000mAh = 37 Wh
This value represents, for comparison, on the back of the Power Bank.

"Wh 37 indicates the power that can be abgebeben maximum within an hour."

The Power Bank provides an output voltage of 5V is available, therefore must be an internal voltage regulator, the battery rated voltage of 3.7V to 5V converter. Now it will be exciting, because the specified capacity of 10000mAh is only available with 3.7V. The actual available capacity must be recalculated at an output voltage of 5 V:

Energy in Wh / output voltage = Calculated capacity
37 Wh / 5V = 7400mAh

Using a suitable measuring instrument I have performed on this PowerBank a capacity test and was unable to determine a capacity of exactly 7818mAh. The tension was fairly constant during the test at 4.9 volts.

A measured capacity of 7818mAh is an outstanding value for that battery, because mathematically should only 7400mAh are available. Usually occur in the voltage conversion (3.7V to 5V), additional losses of about 10%. This is not the case for this battery.

This Power Bank has at the output thus an actual capacity of 7818mAh

After several tests, I found that this procedure is so common with most manufacturers. It is almost always indicated the nominal capacity of the built-in battery. The actual capacity which is available at the 5V output is not specified.

Conclusion:
The stated capacity of the producers of Power benches are absolutely correct, but almost always refer to the internal built-in battery with a rated voltage of 3.7V. By the voltage conversion to 5V, the available capacity is much lower.

"Nominal capacity is the actual capacity"

What's more, ... Rank: 1/5
March 21
Excellent value 29 Rank: 5/5
January 1
Classic but vintage but fun Rank: 5/5
February 9
Quality. 7 4 Rank: 5/5
January 4
Same as the original 6 Rank: 4/5
January 5
if resigned on twiling princess Rank: 2/5
February 18

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