A small and powerful Power Bank for your pocket

Although I already have a few battery packs with different capacities, but these are all larger models and are not really in your pocket. So it happened already often that I go ran out of juice and I had no battery pack case.
The batteries of modern smartphones usually do not last longer than a day and if you're driving, you have the opportunity, the mobile device fast recharge. Should not be underestimated even charging in the work. According to current law, charging personal devices is prohibited in the workplace and can even draw a warning to himself. With a battery bank has no longer this problem and is on the safe side. In addition, an external battery pack is also useful if you're like me and like to hike in the mountains on the way, so you do not have to fear for a discharged battery in an emergency.
Another note to the manufacturer's instructions: As smartphones and other mobile devices for loading require a constant and stable voltage of 5 V, this will switch off the charging process when a certain threshold is not reached, so that there remains a certain residual charge in the battery pack. So we can compare the load times of various smartphones with the same battery capacity not readily available. Since the capacity to 3.7 volts refers and also losses in the transformation of energy, so you will never find out the energy from the manufacturer's specification of the battery pack. Mostly you have to subtract about 30% capacity of the manufacturer's specification. But even that is not necessarily always the case, since you do not know on what basis the manufacturer makes his statements and if he has not already taken into account losses.

Scope of supply:
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The external battery is located in a small box and is again specially protected by a plastic inlay which is not welded fortunately at the edges as other manufacturers like to do with their products. Opening We then usually the puzzle. Also included are a flat Mini-USB cable and a concise, multi-lingual instructions incl. An articulate, German version.
Technical Specifications:
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Capacity: 6000 mAh
Charging Power input: DC 5V 1.5A (max)
Charging current output: DC 5V 2.1A (max)
Dimensions: Width: 7.7 cm; Length: 9.8 cm; Thickness: 1.8 cm
Weight: 182 grams
Charge time: 3 to 4 hours

Design and processing:
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The battery has a perfect finish and stable. It is available in different colors like pink, gold, blue or black. I have the black version. The coating is in shiny piano black design, which of course fat and fingerprints magically attracts.
On the sides has the power bank, regardless of the housing color, a silver-colored edging.
The mini-USB port for charging and USB charge jack located on one end side. Similarly, the extra flashlights LED. The power button is located on the long side near the terminals.
The 4 blue charge indicator LEDs are visually appealing built into the casing and gives the Power Bank as an elegant design.

Operation - Charging - Quality:
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A note about the loading times:

The charging time of a smartphone depends on very many factors. The key example is the output current of the charger. Charging with USB 2.0 provides only 0.5A charging current, with USB 3.0 you get at least 0.9 A. The charger of the Samsung Galaxy S4 delivers 2.1A and my Tablets Sony Xperia S nevertheless still 1.5 A, in each case based to 5 volts. Most battery banks provide reportedly up to 2.1 A at 5 volts. But not enough. The internal charging electronics and the cable used significantly influence the time to full charge. Longer cables cause some high power losses due to the greater resistance, so that in extreme lengths of the charging current can even be halved. Some devices refuse to charge in certain circumstances. Therefore I use in my tests only chargers with connection for a USB cable, so I can always use the same cable and charger. In addition, more will be added that according to the specification of the USB Forum of maximum charging current is limited to 1.5A. If you want to load a smartphone or tablet with a charger that provides a higher current, the device must support the AC-charging mode, which allows to load with higher currents. When Samsung Galaxy S4 this is at least the case.

First of all, the battery pack itself needs recharging, which takes about 3 1/2 hours and at a current consumption of 1.5 A corresponds to the manufacturer's instructions.

Both during charging of devices, as well as when charging the Power Bank, signaling 4 blue LEDs the state of charge in 25% increments by pressing the button you get at rest, the current capacity indicated by an appropriate number of lit LEDs. So you always have an eye on the condition of the Power Bank is.

The charging time is relatively easy to determine: time = (capacity in mAh / charging current in mA) x 1.3 (correction factor for loss by eg heat). This is only a guideline, for a rough estimate.
In order to obtain an approximately similar initial state before loading, it was connected the device only after automatic switch-off due to the empty batteries and were turned back on only after it is fully charged. In practice, therefore the loading times may vary, the time you phone so often invites when switched on.

Laden with power supply:

This means that the charging time of a Samsung Galaxy S4 would take with the supplied charger (2100 mA) at a battery capacity of 2600 mAh 1.6 hours or approximately 95 minutes. In fact, the Samsung Galaxy S4 requires loading with original accessories about 110 minutes.
My Tablet needed with original accessories (1.5A) for about 4 hours and when using the Samsung Galaxy S4 charger with 2.1A even only about 3 hours.
The Samsung Galaxy S3, the charging with 2.1 A charger takes about one hour.

Laden with Power Bank:

For my test I have the Samsung Galaxy S4 (2600 mAh) Samsung Galaxy S3 (2100 mAh) and my Sony Xperia Tablet S (6000 mAh) used. Charging begins by connecting a terminal automatically.
The Samsung Galaxy S4 I could charge about 1.7 times what is roughly estimated a capacity of approximately 4500 mAh. The Samsung Galaxy S3 charging about 2 times took place. My Tablet Sony Xperia Tablet S could not be fully charged, which was also to be expected. The results with the three mobile devices indicate a actual usable capacity of about 4500 mAh, which is a pretty good value for a battery pack. Compared with other battery packs tested by me (8400 mAh EasyAcc and Supremery 7800 mAh), the Bank is still considerably RAVPOWER power forward with a yield of about 75%.

The loading speed is almost the same manufacturer: The Samsung Galaxy S4 was charged with me in about 120 minutes and the charging process lasted so almost as long as the original power supply, which also delivers 2.1A. Also the Samsung Galaxy S3 charging needed not much longer than with the original power supply. The charging time my tablets was 4 1/2 hours, so that the promised charging current could be used here.

The load times therefore comply with the manufacturer's instructions and are to be classified as very good.

Conclusion:
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The RAVPOWER Power Bank is a very good mobile power station with low loading times, which is particularly suitable for the road if you have no luggage or no rucksack. In this case also not interfere with the lower capacity as compared to larger models. By design, they also like it very much, so that I can give this product an unqualified recommendation.