Satisfactory power bank with problems with overload protection and voltage drop during discharge.
last modified: 11.10.2019, 10:20
The RealPower 10.000 mAh has 3 outputs and can, therefore, load up to three devices simultaneously. It can also be charged and discharged simultaneously. However, the power bank heats up strongly during discharge and the long charging time is also noticeable negatively. Despite overload protection, this power bank allows a significantly too high output current, which can lead to long-term damage to the device. Unfortunately, this product mainly stands out negatively due to these characteristics.
The RealPower 10.000 mAh is the only power bank I tested in the category with 10.000 mAh that has three outputs and can charge three devices simultaneously.
With its cuboid design, the RealPower 10.000 mAh can yet be held with one hand. In addition, it has a rubber coating and looks well produced. The outputs and inputs are located on the upper side and the display to indicate the charge level is located on the front.
The power bank has 2 USB outputs (1 A and 2.1 A) and one USB-C output (2.1 A). The RealPower 10.000 mAh can charge three devices in parallel and can be charged and discharged simultaneously. The maximum output current at all outputs together is 3.4 A according to the manufacturer. Either the USB-C (2 A) or the Micro-USB input (2 A) can be used as input for charging.
Since power banks never have their full capacity available, I measured the usable capacity of the RealPower 10.000 mAh by discharging it via a resistor and recording the power. For this test I have set a current of 2 A. The measured capacity is about 8.200 mAh. This corresponds to 82 percent of the stated capacity of the manufacturer.
You can see the power output during the discharge in the following graph:
It is noticeable that performance begins to decrease after one hour. The reason for this is that the applied voltage decreases. Towards the end this is only about 4.4 V. This is the lower limit of the permissible supply voltage, because according to the USB specification, the voltage must be between 4.45 V and 5.25 V. This is the lower limit of the permissible supply voltage.
You can see the detailed voltage curve during discharge here:
To measure the charging time, I connected the power bank to a power supply that can deliver the maximum charging current of 2 A. The power bank is connected to a power supply that can supply the maximum charging current of 2 A. The power bank is connected to the power supply of the Power bank. The charging time of the RealPower 10.000 mAh is about 7:40 hours. The charging current is approx. 1.6 A.
Both during charging and discharging, I noticed substantial warming of the power bank with our thermal imaging camera. The higher temperature is reached during discharging and amounts to approx. 49 °C. I measured a temperature of 42.5 °C during charging.
Short-circuit behaviour and overload protection
A short circuit can damage the power bank and in the worst case lead to a fire. Such a short-circuit can be caused by a defective cable, for example. In order to investigate the behavior of the power bank in such a case, I intentionally short-circuited it. The RealPower 10.000 mAh switches off immediately and is still functional after the short circuit.
I also investigated the behavior of the RealPower 10.000 mAh in case of an overload. First I increased the current consumption of a connected consumer until the power bank switches off.
- The USB output, which is designed for 1 A, switches off at 2.4 A. The power consumption of the power bank is increased until the power bank switches off. The supply voltage drops down to 3.5 V
- The USB output, designed for 2.1 A, switches off at 3.2 A. The supply voltage drops down to 4 V.
- The USB C output designed for 2.1 A, switches off at 3 A. The USB C output designed for 2.1 A switches off at 3 A. The supply voltage drops to 3.7 V.
These currents are not yet harmful to the power bank, as it is designed for a total of 3.4 A, but the supply voltage of only 4 V is too low for charging.
More problematic, however, is that the RealPower 10.000 mAh allows a current of 4.8 A with several connected consumers. This current, which is 1.4 A higher than the maximum current of 3.4 A specified by the manufacturer, can cause long-term damage to the power bank.
Falling to the ground is no problem to the power bank RealPower 10.000 mAh. I dropped the power bank in our office from a height of one meter onto the hard carpet. On the outside, there was a small scratch in the rubber coating and no damage and the power bank still worked perfectly.
We have evaluated about 25 reviews on the Internet. In summary, it can be said that about 75 percent of buyers are satisfied (4 stars) or even very satisfied (5 stars). Partially (2 stars) or completely dissatisfied are about 25 percent of the users. The average score at the time of the evaluation was 4.0 out of 5 stars.
The following points were positively noted:
- Can charge three devices at the same time
- Digital energy display
The following points were noted negatively:
- The long loading time of the power bank
- Bad instructions
|Scope of delivery||2 x charging cables (USB -> microUSB, USB -> USB - C; 20 cm x 20 cm), manual|
|Inlets||1x Micro-USB (5V/2,1A), 1x USB-C (5V/2,1A)|
|Outlets||1x USB (5V/2,1A), 1x USB(5V/1A), 1x USB-C (5V/2,1A)|
|Charge indicator||Display - charge level indicator|
|Capacity (manufacturer)||10.000 mAh|
|Capacity (measured)||8.200 mAh|
|Charching time||7:40 hrs|
|Additional warranty||12 months|
|Simultaneous charging and discharging||Yes|
|Loading several devices in parallel||Yes, 3|
|Packaging||Informative, magnetic closure|
|Quality of instructions||Short, understandable|
|Manual language||GER, EN, FR|
|Range of functions|
|Size capacity ratio|
Check our main page to get an overview of all tested products within this category.Overview: Power Banks with 10.000 mAh
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