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Tuesday, April 28, 2015

Product review: KMASHI MP836 15000mAh (2Amp+1Amp Output) Dual USB Portable Fast Charger Ultra-High Density External Battery Pack




♦ size: 6 1/8" x 3 1/8" x 3/4"
♦ weight: 1 lb 0.6 oz
♦ number of ports: 2
♦ flashlight: no
♦ pass through charging: no (i.e. the battery can charge while being charged itself)
♦ cables: 1 charging cable

The external battery performed pretty well charging my devices but I have been able to fully charge it. No matter how long I keep the battery charging the forth light in the charge level indicator continues blinking, I never got 4 steady blue lights even after charging the battery for 24 hours.

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 one that do not perform well. Note that these tests are not testing for the maximum current each device can draw on each port.

I also tested to see if the battery supports pass-through charging (i.e. whether the battery can charge mobile devices while it is being charged). This battery does NOT supports charge through charging. It can not charge while being charged.

Finally, 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:
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port 1: 1.03A/5.06V (excellent comparing the performance of the same device with other chargers)
port 2: 0.95A/5.06V (good 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: 0.93/5.08V (average for 1A port for the same device with other chargers)
port 2: 1.35A/5.10V (good 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, some of the battery capacity is always lost to heat, voltage conversion, and operation of the power bank itself. I always estimate that 30% of the capacity will not be available for the charging of the device.


You can find it on Amazon by following this link.


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