Buy Anker 2nd Gen Astro 6400mAh Portable External Battery Charger with PowerIQ Technology for iPhone 6 5s 5c; iPad Air mini; Galaxy S5 S4; Note 4 3; LG and More (Black)

CUSTOMER REVIEW



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This battery pack is beautifully packaged with a black rubberized coated case. The black rubber coating is slightly textured so it is not a fingerprint magnet and it improves the looks of the case and your grip. It is a powerful battery pack rated at 6000 mAh of capacity and the test results were spectacular! I put together a video of the unit and the test results for your review.



The battery weighs in at 4 3/4 ounces. The battery pack has one USB output port that outputs 5 VDC at 2 Amps. It is a smart USB port whose output current will never exceed the capacity of your smart device's current charging capability. The battery is extremely energy efficient and its performance is 10 percent or more above the standard performance of a normal designed external battery. This is because of the superior quality of the battery cells used and the advanced control circuitry within the battery.



During the testing the temperature of the battery pack never even exceeded ambient room temperature. To start your device charging you connect it with the proper cable and the battery pack charging starts automatically. To check the battery pack charge status you have to shake the battery and the LED ring lights up.



This product is outstanding and I rate it at 5 stars. If you are a business person or a student and have to depend on your tablet or smart phone for long periods of time without the ability to get to an AC power source then this is a good battery to own. This is good for those who travel a lot or camp out. Now you can watch your movies or listen to your music on those long airline flights. While this battery pack can put some charge into your tablets it is more ideal for use in recharging your smart phone. Because of its size it is great to drop into a purse, briefcase or a pocket.



You should note that I did not operate my tablets or phones 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.



Items in the box:



* The Anker 2nd Gen Astro 6000 mAh battery

* The battery pack comes with an instruction manual.

* A USB charging cable that is 12 inches long.

* A nice carrying bag for the battery

* You may have to use the charging cable that comes with many of your own devices.



Anker 2nd Gen Astro 6000 mAh External Battery Pack Features:



* Powerful 6000 mAh capacity

* The unit is compact and weighs in at 4 3/4 ounces.

* Attractive design with a black rubberized external coating. The black rubberized coating is slightly textured so it is not a fingerprint magnet and easy to grip.

* The specifications and ports are nicely labeled on the case.

* It has 10 LED status lights in a ring located on the front that indicates the battery charge level. You have to shake the battery and the LED ring will light up and indicate the battery charge level. Each LED represents 10% of capacity.

* This is an ideal size and power of battery to carry in a purse, briefcase or backpack for your smart phone!

* There is one USB power output. It is a USB port rated at 5 VDC and 2 Amps and it is a smart USB port the uses only the current required by your device to properly charge it as quickly as possible.

* When you plug in a device then the charging process of your device begins automatically.

* The battery pack uses Lithium battery technology.

* The battery pack can be recharged 500+ times

* Warranty is 18 months

* The battery pack does not come with an AC wall charger. It is specified to be charged with 5 VDC at 1 amp. It will charge in 5 to 6 hours at 1 Amp input. You can charge the battery using a USB 2.0 port of your computer that is rated at 500 mA but the charging time will be 11 to 12 hours.

* The battery is extremely energy efficient and its performance is 10 percent or more above the standard performance of a normal designed external battery. This is because of the superior quality of the battery cells used and the advanced control circuitry within the battery.



Test charging devices to measure the output capacity:



I charged the battery pack fully before I started my test. I started with a Kindle Fire at 25% and the Anker 2nd Gen Astro was fully charged with 10 LEDs.

* 30 min Kindle Fire at 48% and the Anker battery had 6 LEDs

* 60 min Kindle Fire at 70% and the Anker battery had 4 LEDs

* 90 min Kindle Fire at 82% and the Anker battery had 4 LEDs

* 120 min Kindle Fire at 87% and the Anker battery had 4 LEDs

* 150 min Kindle Fire at 100% and the Anker battery had 4 LEDs



I started with an iPhone 5S at 22% and the Anker 2nd Gen Astro at 4 LEDs.

* 30 min iPhone 5S at 54% and the Anker battery had 3 LEDs

* 60 min iPhone 5S at 84% and the Anker battery had 2 LEDs

* 90 min iPhone 5S at 95% and the Anker battery had 2 LEDs

* 120 min iPhone 5S at 100% and the Anker battery had 2 LEDs



A second iPhone 5S at 79% and the Anker 2nd Gen Astro at 2 LEDs.

* 30 min iPhone 5S at 97% and the Anker battery had 1 LED

* 60 min iPhone 5S at 100% and the Anker battery had 1 LED flashing



I started charging an iPad 2 at 10% and the Anker 2nd Gen Astro at 1 LED flashing.

* In two minutes the iPad was at 12 % and the Anker battery was dead



Summary of charging tests:



* Charge an Kindle Fire 75% x 4400 = 3300 mAh

* Charge an iPhone 5S 78% x 1560 = 1216.8 mAh

* Charge a second iPhone 5S 21% x 1560 = 327.6 mAh

* Charge and iPad 2 2% x 6944 = 139 mAh



* Test result = 3300 + 1216.8 +327.6 + 139 =4983.4 mAh/6000 mAh = 83% efficiency



* That is an outstanding efficiency result for this battery.



Here are some common devices and the amount of mAh of capacity they have when they are fully charged. This is just to give you an impression of how much energy it takes to charge your smart device:



* iPhone 4 battery 1,420 mAh battery capacity

* iPhone 4S battery 1,432 mAh battery capacity

* iPhone 5 battery 1440 mAh battery capacity

* iPhone 5S battery 1560 mAh battery capacity

* iPad 2 battery 6,944 mAh battery capacity

* iPad 3 battery 11,560 mAh battery capacity

* Kindle Fire battery 4400 mAh capacity

* Kindle Keyboard battery 1750 mAh capacity

* iPad 4 battery is 11,486 mAh 3.7 VDC at 42.5 Wh

* iPad Mini battery is 4490 mAh at 3.72 VDC 16.7 Wh



As you can see the Anker 2nd Gen Astro 6000 will not fully charge a totally dead iPad 2, 3 or 4 because it only contains 6000 mAh of capacity. You have to consider the losses in the charging circuits of both the battery pack and the device you are charging. When using an external battery you have to allow approximately 30 % of the battery capacity will be lost to heat, voltage conversion, powering the batteries electronics and the electronics of your electronics device's charging circuits. In addition you have to consider that your device is not truly off like a cell phone is still connected to the WIFI and phone networks and probably receiving emails, etc.



Real world examples of charging capability with this battery pack:



* iPhone 4 approximately 351% of a full charge out of a fully charged Anker 2nd Gen Astro 6000 mAh battery pack

* iPhone 5S approximately 319.5% of a full charge

* iPad 2 approximately 71.8% of a full charge

* iPad 3 or 4 approximately 43% of a full charge

* iPad Mini approximately 111% of a full charge

* Kindle Fire approximately 113% of a full charge



* A normal estimated usable storage is 70% of capacity or .70 * 6000 mAh = 4200 mAh charging capacity available for your electronic devices.



* In my testing I was able to use approximately 4983.4 mAh of capacity or roughly 83% of the 6000 mAh capacity. This is an outstanding result.



I received a sample product for evaluation and I promised to provide a fair and honest review.