Poweradd™ Pilot 2GS 10000mAh Dual USB Portable Charger Backup Battery Pack with Quick Charge and Aluminum Body Design for iphone 5S 5C 5 4S, iPad Air Mini Retina, Samsung Galaxy S5 S4 S3, Note 3 2,HTC One, Nexus 5, LG Optimus,other Smartphones and Tablets (Apple Adapters Not Included)..
Special Price Poweradd™ Pilot 2GS 10000mAh Dual USB Portable Charger Backup Battery Pack with Quick Charge and Aluminum Body Design for iphone 5S 5C 5 4S, iPad Air Mini Retina, Samsung Galaxy S5 S4 S3, Note 3 2,HTC One, Nexus 5, LG Optimus,other Smartphones and Tablets (Apple Adapters Not Included) By Poweradd™
Most helpful customer reviews
15 of 16 people found the following review helpful.
A beautiful design that is about the size of an iPhone 5S and easily fits a purse or a jacket pocket!
By jjceo
Watch Video Here: http://www.amazon.com/review/R2ZA1I1LIAI9B0 This is just a very attractive product that works well and looks fantastic. It is the perfect size to toss into a purse, briefcase or pocket to give your phone a 100% charge very quickly. It is about the same size and shape as an iPhone 5S and it weighs in at 7 ounces. The outside of the case is silver and the ends are white. This battery had very good test results of 77.9% efficiency and it can charge an iPhone 5S 410% of a full charge.
The battery has one USB output port rated at 5 VDC and 2.1 Amp output. The charging input port is a Micro USB plug that requires 5VDC at 2.1 Amps and it takes that it takes about 3 hours to fully charge. The battery is a lithium polymer design and should be able to be recharged up to and over 500 times. (Please note that neither the manual nor the web page specifies the lifetime of recharges.) You can use your computer's USB port, an AC USB wall charger or even a USB car charger. Using a 2.1 Amp input is of course the fastest was to charge the battery and the other methods will take longer to recharge the batteries capacity.
There is a power button of the end of the battery pack that you can press to check the remaining charged capacity of the battery. There are 4 small white LEDs that light up and each LED represents 25% of the battery's potential charge. When you are charging your device you do not need to press the same button in order to start the charging of your iPad for example.
You should note that I did not operate my tablet while I charged it but the WIFI and phone transmitter were left on. When I test a battery I do an extensive set of tests that fully charges the battery and then I use it to charge devices and make sure that it is fully depleted when my tests are done. I time each test and document the results as the test progresses. I then calculate the mAh of capacity that the battery supplied and I then calculate its charging efficiency. This process takes from 3 hours to, in very large batteries, about a day for testing. I don't take any short cuts or guess and every battery has these tests performed on it and documented. This is to assure that the battery is tested and it performs well. If a battery has performed poorly I then run the tests again to verify the results.
Poweradd 8200 mAh Battery Pack test data:
iPad 2 at 8% battery fully charged - 4 LEDS
* 30 min iPad at 23% - battery 3 LEDS
* 60 min iPad at 38% - battery 2 LEDS
* 90 min iPad at 52% - battery 2 LEDS
* 120 min iPad at 65% - battery 2 LEDS
* 150 min iPad at 78% - battery 1 LED
* 180 min iPad at 90% - battery 1 LED
* 210 min iPad at 96% - battery 1 LED
* 240 min iPad at 100% - battery dead
Summary of the testing:
* 92% x 6944 mAh = 6388.48 mAh / 8200 mAh = 77.9% efficiency
* This is an excellent result for this battery and indicates that it is very efficient. Anything above 70 % is above average.
What is in the box?
* The beautifully packaged battery pack the only weighs 7 ounces
* An instruction manual
* Charging cable the is 30 inches long and it is a USB to a Micro USB cable
This is a very good product. The beautiful battery is just the right size for many applications and is it very nicely designed and packaged. Like I mentioned it is ideal for your purse or jacket pocket. I rated it as a 5 star item.
I was supplied a sample of the product for test and evaluation and I promised to provide a fair and honest review.
4 of 4 people found the following review helpful.Slim Styling, Versatile & Convenient
By George
After having purchased over 20 different power banks, I received this unit free for review. It compares well with others in it's capacity class. The slim, brushed aluminum case looks very nice. It weighs 9 ounces, measures 2 & 7/8 by 5 & 1/2 inches and 9/16 inches thick. It has a small test button to determine the charge. During re-charge the lights stay on; during discharge they light only briefly to conserve power. It is capable of being re-charged at up to 2A. When charging other devices, it has dual USB outputs of 1A and 2.1A with single and dual lightning symbols. The charging cord supplied is heavy duty and carries the high currents better than most. Trying some other cords limited the current severely due to thin gauge wires. Unlike most power banks, which show 3-4 lights for a long time then die fast, this unit still has 47% of its available charge when it goes to a single light and about two-thirds available when it goes to 2 lights on.
Upon receipt, it showed two lights on. It charged to 100% in about 2.5 hours starting at 1.4A with a current meter in the circuit, which can limit the current.
The 4 charge indicators are not linear. Instead of each one representing 25% charge,
when re-charging:
all 4 on indicates 90-100%, so leave it on the charger a while longer after it lights that fourth light,
4th blinking is 60-90%,
3rd blinking is 30-60%,
2nd blinking is 10-30%,
and one blinking is 0-10%. My rough checks indicate the re-charge lights work as specified.
When discharging:
all 4 on is 90-100%,
3 on is 70-90%,
2 on is 40-70%,
1 on is 10-40%,
and none on, but still providing power, is less than 10%. My initial tests indicate that the fourth and third lights go out quicker. Then the final lights last much longer.
I started my tests with both outputs supplying .86A while maintaining 4.90V for a combined power of 1.72A. After 2 hours, my Kindle keyboard was fully charged, having started at about half charge. During that time the power bank got noticeably warm. As expected the 4th light went out quickly and the third not quite as fast. I continued charging the second device for another 2.6 hours at .85A. Total power delivered was 1.72A x 2 hr + .85A x 2.6 hrs = 5.65 amp hours. It then had one light lit. I assumed it was probably near empty, so re-charged it in about 7 hours.
For the second test, I took it all the way from 100% to empty as follows:
Charged my Clip Zip from 66% to 100% at .15A in 40 minutes while the MP3 player continued to play. Not a heavy test, but rather shows that the stated 80ma cutoff current is low enough to fully charge small music players - something many power banks cannot do. About .1Amp-hr (Ah) supplied so far.
Charged my simple Alcatel cell phone from zero to 100% with a starting current of .61A. It finished in 1.75 hrs, tapering off at the end for another .8Ah. Total so far of .9Ah or 9% of capacity - bank showed 3 lights - on the edge of the predicted state.
Then I charged my ASUS HD 7 tablet from 56% to 100% in 2.25 hr, starting at 1.2A from the high power outlet. 44% x 3.8 = 1.67 Ah, 2.57 Ah so far or 26% of capacity - 2 lights still lit. Amp-hr supplied was calculated from the charge state of the tablet, which may be on the low side, since the tablet was in sleep mode and drawing a small current. Predicted state would have been still 3 lights.
At this point I had charged all my devices except some of the other power banks. I picked a depleted ECTech 12K bank as the final test load, charging at a steady rate of .95A again through the current meter. After 1 hour, the Poweradd bank was down to 1 light. Total power supplied was 2.57 + .95 = 3.52 Ah or 35% supplied thus far. Predicted state would have been 2 lights. Not looking good at this point. But I continued. After another 1.85 hr the last light went off for another .95 x 1.87 = 1.78 + 3.52 = 5.3 Ah so far. I figured it was near the end. But it kept supplying .95A for another 1.4 hr, maintaining a steady 4.90V, with the current actually rising to just over 1.0 A in the final minutes. So another 1.4 x .95 = 1.33 + 5.30 = 6.63 Ah delivered. Total delivery of 6630 mAh x 4.90 V or 32.5Watt-hr. Figuring the average Li-polymer cell voltage was 3.7V, the bank holds 3.7 x 10 = 37 Watt-hr for a decent converter loss of 12%. After the last light went off, it continued to supply about 20% of the total delivered power, not 10%. When it went to a single light on, it still had 47% of the total delivered power left, not 40%.
Li-polymer cells sometimes take a few charge cycles to reach maximum capacity, so I will report again after a few more cycles.
In summary, don't give up hope when those lights start going out, those last lights indicate more power left than you think. It should keep delivering full current and voltage right up to shut down - much better than most power banks. It is packaged in a slim, elegant case with good versatility. Use the better than average provided USB cord, if possible, when transferring high currents. Light duty cords will not deliver full power. While you can use both outputs at once, do so with caution - that heat build up indicates extra power loss. If you trip the (unstated) maximum current draw or hit the high temperature limit it will go into safety shut down. That requires disconnecting it, cooling down, and putting it back under re-charge for a while to reset the limit circuits.
Update 4/14/2014:
Ran one more test today. Discharged the bank from 100% to off at .83A to .89A, current meter in circuit always. Obtained a total of 6950 mAh or 34.2 Wh at 4.92V output. A little higher than the previous test showing only 8% loss in the converter. During this test the lights changed by:
4 lit - 97-100%
3 lit - 68-97%
2 lit - 47-68%
1 lit - 4-47%
none lit 0-4%
This time the bank was near empty when the last light went off. It still went to one light at about 47% remaining.
3 of 3 people found the following review helpful.Recharge any tablet or phone, and it's almost indestructible
By J. Chambers
Watch Video Here: http://www.amazon.com/review/R2GIW8R4FR0OY3 Out of the box, the most obvious thing about the Poweradd Pilot 2GS portable battery charger is the all-metal case. It looks to be practically indestructible or at least able to take some abuse and keep on working. But how does it perform as a portable charger? Pretty well in my opinion. I charged it up and used to recharge my Kindle Fire HD 7" tablet, which has a 4400mAh battery. When I began the test, the tablet had a 4% charge. It reached 100% after 147 minutes. The average charging rate of 0.65% per minute is about as good as I've achieved with any portable charger. The Kindle Fire was drawing up to about 1.7 Amps from the battery charger, which is about the maximum for that tablet, I believe. Two of the LEDs were still lit, which according to the user guide indicates that the battery charger had 40%-70% charge remaining.
The two output charging ports are labeled with lightning bolts - one bolt is the 1A output, and two bolts is the 2.1A output. I did a short test to charge my tablet and my phone simultaneously. I did not do a quantitative measurement, but both devices were recharging steadily. The charging kit comes with one 13" USB charging cable with a micro-USB plug.
On my scale, the charger weighs 9.05 ounces. At 5½" in length, it will fit in some pockets, but in a backpack or purse, it would hardly be noticeable.
A product sample was provided for review purposes.
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