Product review: Key Power® External Battery Charger 10,400 mAh Portable Power Bank

This battery is quite compact for 10400 mAh capacity. It is 2 3/8"L x 5 5/8"W x 3/4"H. It has two ports and a small built-in flashlight. This external battery does NOT support charge through (it can not charge devices while it is being charged).

I like its bright charging level indicator. The indicator comes on when you plug in a device or when you press the on button and then turns off in a few seconds.

This charger did very well with my iPad Mini on port B. The results on Port A as well as the results of test for Nexus phone were below optimal (although above USB rate). I am including test results below for those who are interested in the details.

This external battery capacity is rated at 10400 mAh. Some capacity is lost to inefficiencies such as heat you can expect to get about 7800 mAh out of it. I was able to charge my Samsung Nexus phone with 3800 mAh extended battery from close to empty to full twice.

To tell how various battery packs perform I measure their performance with a current monitor. I use Samsung Nexus phone and iPad Mini for testing to give me a Android and an Apple mobile devices. I test all my chargers using the same charging cables and starting all tests at same charge level of the phone to account for non-linear charging. This allows me to compare different batteries to each other so I can rate the battery keeping everything else constant.

Samsung Nexus phone:
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Key Power A port:___ 0.76/5.00V (below optimal)
Key Power B port:___ 0.74/5.00V (below optimal)
(for comparison the best charging monitor result for this phone is 1.00A/5V)

iPad Mini tablet:
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Key Power A port:___ 0.93/4.87V (below optimal)
Key Power B port:___ 1.62/4.87V (Excellent!)
(for comparison the best charging monitor result for this tablet is 1.70A/5V)

I was most impressed by the performance on port B for my iPad Mini, This battery pack is optimized for fast charging of Apple devices on port B. It has a nice capacity and two ports. If you use Android devices and speed of charging is important this is not the speediest battery pack available.


You can find it on Amazon by following this link


Ali Julia review ★★★★☆