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AUKEY 20000mAh Portable Charger with Lightning and Micro-USB Input, 3.4A Dual USB Output for iPhone 7/7 Plus, Samsung and More
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- 20000mAh Portable Battery - Fully charge your iPhone 7 Plus 4.5 times or a 9.7-inch iPad Pro 1.5 times
- Dual USB ports, combined 3.4A output - Simultaneously charge 2 iPads at max speed with more current. Use the same Lightning cable to charge your iOS device or Power Bank
- AiPower - Tuned to adaptively provide the safest maximum recharge rate for all your USB powered devices
- Built-in safeguards protect your devices against excessive current, overheating, and overcharging
- Package Contents: AUKEY 20000mAh Power Bank, Micro USB Cable, User Manual, 24 Month Warranty
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|Sold By||Aukey Direct||AnkerDirect||AnkerDirect||AnkerDirect||Aukey Direct||Aukey Direct|
|Item Dimensions||3.26 x 5.9 x 0.8 in||2.28 x 6.64 x 0.87 in||2.36 x 3.62 x 0.87 in||3.2 x 3.8 x 0.9 in||3.26 x 5.9 x 0.8 in||3.25 x 5.89 x 0.83 in|
|Item Weight||0.86 lb||0.78 lb||6.4 ounces||0.56 lb||0.86 lb||0.86 lb|
Recharge with a Lightning Cable
The AUKEY PB-N36 Power Bank can be recharged using either Lightning cable or micro USB cable. Now you can conveniently use the same cable to charge your phone and external battery.
Tuned to support healthier battery function and faster USB charging speeds, AiPower intelligently adjusts power output to match the unique charging needs of all your USB powered gear. With up to 2.4A of dedicated adaptive output per Ai USB port, your devices will each receive the safest maximum recharge rate possible. Advanced circuitry and built in safeguards protect your devices against excessive current, overheating, and over charging.
Universal Charging Compatibility
Keep your devices charged on the go with dual USB charging ports. Equipped with built-in flashlight and LED battery indicator. Designed to work with all popular USB powered devices from iPhones to Android phones, tablets, photography gear, Bluetooth speakers, headphones and more. Whatever USB powered gear you've got, we've got you covered.
24 Month Warranty
Whether it’s your first AUKEY purchase or you’re back for more, rest assured that we’re in this together: All AUKEY products are backed by our 24 Month Product Warranty.
Lightning Input: 5V 2A
Micro-USB Input: 5V 2A
Output (AiPower): 5V 3.4A (each 2.4A Max)
Dimensions: 5.9” x 3.26” x 0.8”
Weight: 13.7 oz
Top customer reviews
So the Aukey PB-N36 is a rated 20,000mAh (milliAmp-Hours) @3.7v power bank. Reason I stated “@3.7v” is because the capacity of a power bank is always the combinations of two numbers, the Ah (or mAh) and the voltage. The result of that is Whr (Watt-Hours). Which is why you will usually never see a rated 20,000 mAh power bank get 20,000 mAh out the USB port.
Jumping straight into the inside of the power bank… You will see that the two lithium ion batteries occupy 80% of the case and 20% of the case is for the circuitry.
The batteries used inside this power bank are two GED 10,000 mAh batteries produced by General Electronics Battery Co., Ltd. After a quick Google search, I was able to pull up some information about the company. It seems like it is a well established company that produces some quality components for all sorts of uses, power banks being one of them. Not exactly what Aukey claims it has. Aukey claims it has either LG, Sony, or Samsung cells, but there are none of them inside. So I guess Aukey is lying to us? But hey, it’s better than some genetic no name brand cell that can explode any second just by looking at it. I would have hoped to see some name brand cells in there for the price that I’m paying. The batteries are wired in parallel with each other, effectively making a 20,000 mAh giant pack. Exactly what the whole power bank is rated at. The batteries add up to 74 Whr.
Starting with the battery side, you will see a commonly used “DW01” chip. It is a Single-cell lithium ion protection IC. That protection includes Overcharging, Overdischarging, and Overcurrent (OCP). Paired with that IC are 3 IC’s named “8810 ESSY2” I could not find data on these chips, but based on the wiring and pin out. I can confidently say that they are mosfets that switch the outputs of the battery when the DW01 chip tells it to. The reason why this Single-Cell IC is used for the two cells is because the two battery cells are wired in parallel, effectively making it one giant cell; since there is not a real limit on how many mAhs you can have, the DW01 is fine for this purpose.
Once the electrons pass the battery protection phase, the power is first supplied into a microcontroller, “NTMP2012A-1”. That takes care of the “AiO Smart” charging and OCP/OVP (Over Voltage Protection). What this microcontroller also takes care of, are the 3 color LED lights that Aukey implemented for battery status. Curiously enough, Aukey found the need to use 3 LEDs per color; that’s why there are 9 LEDs in total. 3 White, 3 Green, and 3 Red. Personally I would have preferred a 10 LED power wheel that Anker puts on their products.
The microcontroller sends out on/off signals to the boost converter to boost up the 3.7v to the nominal 5v output for the USB. However, it’s not exactly a simple process. So in comes the 3 major components in the boost converter circuit. The mosfets, the fast switching schottky diode, and the large inductor. But one component stands out to me, that is the schottky diode. Aukey rated the power bank for a total of 3.4 Amps output, but the diode has a max forward current of only 3 Amps. That effectively overdrives and stresses the diode beyond its maximum ratings based on its datasheet. (see attached picture…) That is one major failure point of this power bank, although the user can’t possibly pull exactly 3.4 Amps out of the power bank all the time, Aukey still are overdriving internal components beyond its maximum limits. Long term reliability will suffer as the diode’s performance deteriorates with the excess heat generated. Hopefully that 24-month warranty will see some use when this component fails.
Moving on to the charging stage. You have a choice of two inputs, a micro USB or a lightning connector. It is a wonderful combination in my opinion since you can just ask anyone for a cable and you are guaranteed to have the power bank charging; unless of course that person is using a Nokia brick phone. On the input side there is one 6.3v solid state smoothing capacitor. A solid state capacitor is much better than electrolytic, because there are no wet electrolytes to evaporate and expand. It has a higher tolerance to heat vs its electrolytic counterpart. (main cause of electrolytic capacitor failure) But because of its nature, solid state capacitors are not forgiving on the voltage, and if you accidentally plug this into a 9v (or even 7v) charger, you might just be the unfortunate witness of a fireworks show. But that goes with any gadget, beware of input polarity and input voltage.
The layout of the circuit board is very good, there are a large amount of test points that are used for the bed-of-nails testing in the Quality Assurance department. The solder quality is top notch, but that is a minimum requirement for the current state of technology. They found out that the power traces aren’t adequate, so they added solder to the trace to increase current capacity, normal circuit board design technique to save a couple of cents on manufacturing cost. Tin and Lead is cheaper than Copper. The date code of which the board file was create was on 46th week of 2015, so early November. If the date is true, this product was developed and manufactured quite fast.
THE CASING DESIGN…
The enclosure case design of the battery bank is okay, there is quite a bit of wasted space above and below the circuit board. They could have made the board even more compact and fit a bigger battery in there, but that will probably limit the improvement opportunities in the future. The padding of the battery is adequate, since there is barely any room for the battery to slide around, that is not much of an issue. The serviceability of the power bank is not very good. Both sides of the case are heat sealed (pretty much glued with heat) and It took me quite a long time to take it apart without nicking it up too bad.
Bottom-line is, the power bank is pretty good. Given the size of the power bank, I would have hoped for QUALCOMM quick charge; 5v 2A is not fast enough. And as always, I was not paid for this review nor was I given a review item. I am an Electrical Engineering student that used his own money to paid for the item. I will criticize products that are bad, and give thumbs-up to products that I think are designed well. Thanks for reading! Hopefully this review has taught you something new.
Build quality & connectivity:
-Uses 2× 10,000mAh lipo batteries instead of 6× 3350mAh 18650 like other powerbanks of this capacity does. This drastically reduces the price but is not as safe and you should NEVER store fully charged lipo batteries. LiPo batteries should never stored when fully charged, otherwise they will swell up / ballooning.
-Aesthetically speaking this is very sleek looking, with only one button and matte finish. I’m a person who does’t like shiny things and this design is ideal. It is not compact as I can barely hold it with one hand, but was able to fit in in my pocket.
-It has 2x USB ports for output, 1x microUSB and 1x Apple 8-pin lightning for charging.
-This is the fatal flaw I speak of: because you need to press the button once to turn it on, it does not have a sensitive load-sensing function like other power banks. So according to my tests, anything that draws under 0.17A will NOT be considered as a load and the device will shut off after 15 seconds. This means you can’t fully charge small bluetooth headset, or a "nitecore tube" keychain flashlight or power up a low current USB light, unless you have more load connected in the other port.
-Button can display charge level with 3 colors. 0-20% red, 20-60% green and 60-100% white.
-Device will not work while being charged.
-Rated capacity 20,000mAh, or 74Wh. Efficiency is not being mentioned, but that’s ok because we're going to test this!
-Rated 3.4A for total output, I was able to connect two phones drawing 1.7A + 1.5A and the voltage didn’t drop. But I would not recommend charging two power hungry devices at once because it gets hot, reduces the efficiency of the boost circuit and you lose some energy.
-Input was 5V 2A for microUSB and 5V 1.7A for lightning port.
-I used the Aukey 20,000 to charge two smaller 10,000 powerbanks, the average discharging current was 1.7A and it was able to maintain healthy 5V the entire discharge cycle which took about 8 hours, until a sudden shutdown when fully discharged. This is a very good boost circuity.
-YZXmeter displayed 64.3Wh output energy which translates to 87% efficiency, this is one of the highest I’ve seen.
Keep in mind that rated capacity is not the same as output capacity, as the power bank uses 3.7V batteries but has to bump and regulate the voltage to 5V in order to charge our devices.
So you may ask, how much is 64Wh? 64Wh is roughly 8 full charges to an iPhone 6 (requires 8.5Wh to charge 10%-100%).
I’m really happy with the results, at $32.99 this is actually cheaper than most power banks this price range, but poses some dangers by using LiPo cells and not li-ion. I honestly did not expect this kind of efficiency, since it has got a couple negative reviews. I guess that using only half of the output power did help a little, and I always recommend only using 1 port even if your power bank has 2 or 3 if you don’t want to waste energy.
Feel free to ask any question!