Friday, August 28, 2015
Product review: Kmashi MP828 20000mAh Lightning Fast Charging Dual USB External Battery Backup Pack
This is a review for Kmashi MP828 20000mAh Lightning Fast Charging Dual USB 2Amp Input External Battery Backup Pack Power Bank. This seller has a history of re-using the same ASIN number for multiple products, which means the reviews for the old and the new external packs are mixed together and the buyer has to figure out on their own if the review is relevant or not. I got this battery on July 5, so at least as of July 5th this listing was for the 20000 mAh external pack and not the previous product.
♦ size: 6.25" x 2.25" x 1.25"
♦ weight: 14/6 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 and 1 AC cable
The external battery performed very well charging both my Android and Apple devices. The test results showed it to be at the top of ratings for both devices on both ports.
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 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:
port 1: 1.02A/5.06V (excellent comparing the performance of the same device with other chargers)
port 2: 1.00A/5.06V (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: 1.31A / 5.08V (average for 1A port for the same device with other chargers)
port 2: 1.40A / 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 and fast charging rate both both Android and Apple devices. I have been using this battery pack for the past two weeks and have been pleased with it. During a 3 day heat wave I used it to power a USB powered fan and got three days on one charge.
You can find it on Amazon by following this link.
Ali Julia review ★★★★★