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Sunday, August 16, 2015

Product review: AVANTEK 20000mAh External Battery Pack Power Bank


♦ size: 6.25" x 3.125" x 0.75"
♦ weight: 1 pound 1 oz
♦ number of ports: 3
♦ flashlight: yes
♦ cables: 1 charging cable

The external battery performed very well charging both my Android phone and Apple iPadMini tablet.

To see how well different chargers and external batteries charge my mobile devices I use a Nexus phone and an iPadMini to test each of them. The current drawn from the battery depends on each device using the battery. The port rated with maximum capacity of 2A does not always deliver 2A, what is actually delivered is controlled by the device based on many factors such running apps, level of charge, and so forth. I always use the same two devices and I do my tests with the devices charged to the same level, running the same applications and using the same cables to keep everything the same. This allows me to do a relative comparison of each battery and identify the ones that do not perform well. Note that these tests are not testing for the maximum current each device can draw on each port as neither of my devices can max out the port.

I check if the cable that came with the battery is a charging cable (i.e. capable of charging at full AC rate) or a data cable (charging the battery at USB rate). This is easy to tell using the current monitor, and this package includes a charging cable.

Samsung Nexus phone:
~~~~~~~~~~~~~~~~~~~
port 1: 0.99A/5.01V (excellent comparing the performance of the same device with other chargers)
port 2: 0.99A/5.02V (excellent comparing the performance of the same device with other chargers)
port 3: 1.01/5.01 V (excellent comparing the performance of the same device with other chargers)
(for comparison the best charging monitor result for this phone is 1.00A/5V)

As noted above these tests are not designed to test the maximum capacity of the port, so 2A port not showing 2A is not an indication of a problem

iPad Mini tablet:
~~~~~~~~~~~~~~~~~~~
port 1: 1.17A / 5.05V (ok comparing the performance of the same device with other chargers)
port 2: 1.13A / 5.04V (ok comparing the performance of the same device with other chargers)
port 3: 1.05A / 5.04V (ok comparing the performance of the same device with other chargers)
(for comparison the best charging monitor result for this tablet is 1.70A/5V)

The battery has a nice capacity and fast charging rate both both Android and Apple devices. I also use it to run a usb-powered fan and can get several days out of it on one charge.

You can find it on Amazon by following this link.



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