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Reviews (3)
02 May, 2019
Good product if you know how to use it.
1 of 1 found this helpful Good product, but requires a bit of knowledge to interpret the capacity measurements.
The device measures the current passing through it at a current voltage (usually 5V for USB). However, most of Li-Ion batteries voltages are 3.6-3.7V.
Hence, inside the battery charger controller the voltage is converted from 5V to 3.7V (or a bit more) when charging the battery and the current is increased. When the battery is discharged the opposite conversion takes place: 3.7V is converted to 5V and the output current is decreased.
For instance, 1A at 5V is converted to ~1.38A at 3.7V (this figure can be a bit different depending on the efficiency of the converter, battery type, cables etc). The thing is that the number of mAh displayed at the end of the measurement indicates the current at 5V, but it actually is converted from 3.7V.
Therefore, to find out the Li-Ion battery capacity the mAh measurement has to be multiplied by the coefficient 1.38 (or a bit less, but usually not much less than 1.30).
It took me a while to figure out how to interpret the results, but once I figured it out the readings are consistent with the nominal capacities of batteries I have.
20 Dec, 2018
Good capacity and features
Great product. It has the decent capacity with relatively compact size, and supports quick charging in and out. In other words it can quick-charge itself as well as other devices. I had this model for about a year and used it many times. So far I have not noticed any battery capacity deterioration.
30 May, 2018
Great product
I love the quality and the features, especially the fast changing. Allows me to fast charge the phone and also the battery itself! Instead of 8-10 hours for 10000mAh battery it takes 4-5 hours from zero to full. Also, the cable that comes with the battery is great. Very efficient with minimal losses due to wire resistance. It is a bit big, but very slim. Comparing to the previous version, which was considerably shorter, but almost twice thicker it is more convenient IMO. Very recommended.