Unifun 20000mAh Power Bank Backup External Battery Dual USB 2A Fast Charging Portable Charger for iPhone 6S 6 Plus, iPad and Samsung Galaxy S6 Edge
This item at this price, sold by Amazon.com, is currently reserved exclusively for Prime members.Prime free trial and invitee customers: We will automatically apply an Amazon.com Gift Card to your Gift Card Balance in the amount equal to the Prime exclusive discount after you become a paid Prime member. If you cancel your paid Prime membership or return the qualifying smartphone within the first 3 months of your paid Prime membership, we may void your Gift Card or charge you in the amount of the Gift Card. Terms and Conditions apply.
- Constructed with A+ lithium-ion battery cells and build-in intelligent charging microchips to ensure safety use and long lifespan
- Super-fast charge dual USB output (5V / 2A,5V / 1A ) allow simultaneous charging of your iPad, iPhone, Android, and more at high speed.
- 5V 2A (max) input, needs only 10 hours(Save your 50% time on recharging) to full charge the huge capacity 20000mAh external battery with a power adapter of 5V 2.1A or higher output (not included).
- 4 blue LED indicators to display the remaining power;Intelligent circuit design protects against short circuiting, over-heating, over-currents, and over-charging.
- Package content: Unifun 2Amp input 20000mAh power bank, premium charging cable and user manual.
Customers who bought this item also bought
What other items do customers buy after viewing this item?
Have a question?
Find answers in product info, Q&As, reviews
Please make sure that you are posting in the form of a question.
Compare to similar items
|Shipping||—||FREE Shipping||FREE Shipping||FREE Shipping||FREE Shipping||FREE Shipping|
|Sold By||Available from these sellers||eCase||UNIFUN||eCase||Sunvalley Brands||AnkerDirect|
|Item Dimensions||4.76 x 6.73 x 1.06 in||4.8 x 6.8 x 0.9 in||1.14 x 6.1 x 2.97 in||2.52 x 5.47 x 0.86 in||2.76 x 6.5 x 0.94 in||2.28 x 6.64 x 0.87 in|
|Item Weight||0.99 lb||1 lb||0.66 lb||0.61 lb||1.27 lbs||0.78 lb|
Need to charge more than just your mobile phone? Invest in greater, more versatile power with the Unifun 20000mAh Battery.
2A Fast Charging & Recharging
With the 2A fast input, you can recharge the the Unifun battery with a 2.1A or higher power adapter with the included cable - it just needs 10 hours to be full recharged. Twice as fast than 1A input.With the least amount of time fully charging your device.Largely shorten your time!
Double the ports,charge 2 Devices at a Time
With the dual-port of 2A/1A out,thus make your phone or ipad run all the time with the rapidly 1A and 2A output. Charge your iPhone, Samsung and other smart phone with 5V 1A output and your iPad with 2A at full speed at the same time.
High efficiency and safety
Equipped with high quality build-in intelligent microchips,multi-protection system improve both of the charging and discharging efficiency.4 LED indicator obviously let you know just how much juice is left.
Input: Micro USB 5V/2A
Output: USB 1 5V / 1A;USB 2 5V/2A(MAX)
What's in the Box?
Premium Unifun power bank, charging cable, user manual.
Note: As technology updates,the new battery has cool diomand lattice decoration, but still same high quality
Top customer reviews
There was a problem filtering reviews right now. Please try again later.
After charging overnight, I measured about 9.7AH consumed during charging. Will need to perform a full drain to see what the capacity ultimately is, ie, whether you actually get the advertised 20AH from the pack.
I brought these with me to a recent ROC race to do some photography. I recharged 2 iPhone 6S+(s) from 15% all the way up to 100% in about 2 hours, so it seems the OUT2 port is capable of high current charging. After recharging the two devices, the until still showed 4 bars. Very nice.
I can see having these around to keep phones, tablets, and other USB 5V powered devices charged up during a long event.
Side note: For folks who are playing Pokemon GO, you probably already realized it, but that game sucks up battery life! One of these will give you plenty of battery life! It has two ports, so you can actually keep a fellow Pokemon trainer's phone/tablet charged as well!
Originally, I was under the impression that OUT2 did not output higher than 1AH. However, after some testing, it turns out that it in fact does. It just happened to be that the device's power draw differed at different points of the recharge cycle. :( However, this seems inconsistent, so will continue to test this until I have a clearer idea of what's going on.
Various devices I've tested against the OUT2 port and the current draw while charging from an empty state:
PS3 controller: doesn't charge. Requires some kind of active signal/port. (Bad Sony!)
PS4 controller: Charged at around 400-500mAH.
Playstation Headphones: Charged at around 200-300mAH.
Kindle Fire HD 6: Charged at around 900-1000mAH.
Kindle Fire 7: Charges at around 300-500mAH.
iPhone 5S: Charged at around 900-1000mAH.
iPhone 6S+: When over 70%, only charges at around 700-1000mAH. When below 70% seems to charge at a higher rate, between 1000-1300mAH. Using the device in a high drain manner can get the draw up to around 1500mAH.
Also tested some micro-controller boards:
Raspberry Pi 2(bluetooth and usb2-gigabit ethernet adapters): 300-400mAH
WeMos D1 NodeMCU module: 9-15 mAH
So far, I would say that this is a solid 1000mAH per USB port battery back, with an OUT2 that will reach 1500mAH output. After charging all of the above devices and letting it trickle charge the Kindle Fire HD 6 and the iPhone 6s+ over night, it still had a solid 1 bar left over in the morning. Once I get the device to fully discharge it's last bar, will recharge it through the usb pass through meter to see what the total recharge energy consumed will be.
Ordering a USB dummy load so I can test 2000mAH draw to see if it can achieve it. Will also test with an iPhone 6S+ at <15% power levels to see if the draw goes beyond 1500mAH.
*** Update(7-18-2016): ***
Fully drained the battery pack. Plugged it into an AC-to-USB charger with an in-line voltage/current gauge.
Using an AC->5V@3A USB adapter, I see it pulling 0.92 to 0.94 AH. (920-940mAH)
Using an AC->Dual USB@2.4A adapter, I see it pulling 0.92 to 0.94AH. (920=940mAH).
So I'm not seeing the "2A fast charging" feature of the battery pack itself. It definitely recharges itself at 1A max. Once it's done charging, I'll be able to see the amount of energy it has consumed.
*** Update(7-19-2016): ***
The two units are almost fully charged. It's coming up on 24 hours. The 4th bar is still blinking.
I'm charging them with 2.4A and 3.0A USB ports from an AC adapter. So the limit is not on the supply side. The unit only charges at 1A and as it hits the 4th bar, it will drop to around 200-300mAH charge rates.
I had an amp meter measuring, but since the device holds 20,000 mAH the meter hung when it went over 16384 mAH. But based on the measurements before the hang and for the amount of time it's been charging, it's safe to say the unit holds 20,000 mAH of capacity.
So going to keep using this and see whether the cells in the unit hold up to normal use. But going to keep the review at 4 stars because the charging rate of the unit is not 2A as advertised.
it does take a long time to charge it, but when I'm using it to charge the phone while I'm using it, I'm continually surprised at how it not only stops the phone from discharging, but actually charges it up relatively quickly, and lasts much longer than I would expect.
Knocked off one star because of when you drain the life out of it completely. My 2A charger wouldn't charge it above 1 bar, and my 1A charger similarly. Plugged into into a computer (.5A charge), and was then able to get it charged (after a whole day) to 3 bars, and then the 2a charger to get it fully charged. It's been working fine, not letting it fully get drained, with the 2A charger.