Best Certified Rubber Feel Rechargeable Extended 18 Month

Best Anker® 2400mAh MFI Apple Certified Rubber-Feel Premium Rechargeable Extended Battery Case for iPhone 5s, 5 [18-Month Warranty]

This is My Opinion About This Product

After I buy this New Anker® 2400mAh MFI Apple Certified Premium Rechargeable Extended Battery Case for iPhone 5s, 5 [18-Month Warranty] (Wireless Phone Accessory)

Length:: 7:50 Mins
If you are a power user of your iPhone then this case is designed for you. This case more than doubles your working time of your iPhone and it charges your phone quickly. This case is MFI (Made For iPhone) certified by Apple and the lightning connector will cause no issues with your iPhone. After you insert your iPhone into the case you can use the supplied Micro USB cable to not only charge the case and your phone but also to sync your data with iTunes.

What is in the box?

* A dark tinted top plastic phone frame

* A clear top plastic phone frame

* An extension plug for iPhone headphones jack

* The battery base of the case itself

* The charging cable that is 24 inches long

* A brief instruction manual.

The case with a top frame weighs in at 2 ¾ ounces. The bottom of the case extends down and covers the downward facing iPhone speakers so there are two front facing portals on the case for the sound to come out. I actually think the music sounds better when your iPhone is in the case. There is a Micro USB charging port on the side of the case.

When you put your phone into the case and plug in the case to charge then your iPhone will charge first and when is it is at 100% then the case battery will begin to charge. There are four white LEDs on the bottom of the case and 1 LED is 0 to 25%, 2 LEDs lit is 25 to 50%, three LEDs means 50 to 75% and 4 LEDs means 75 to 100%. As the case battery is being charged one of the LEDs will be flashing to indicate what the charge status of the case battery is at. The LEDs are quite bright so I make sure at night that I lay the case with the LEDs facing down as not to light up the area around the iPhone. They can be distracting in a dark bedroom at night. The charging power is specified at 5 VDC and 1 Amp.

When you unplug the case in the morning then the iPhone is using its own internal battery first. I like that as I had another case that always defaulted to using the case battery first. I would rather press the button on the back of the case when I want to charge my iPhone. The power button on the back does slightly extend out of the back of the case and if you press down on the case you can accidently start your iPhone charging.

There is a pop out tilt stand on the back of the case but it is poorly designed and fragile. The first time I popped it out with a fingernail it broke as the metal outer shield came untapped from the double sided tape on the flimsy internal plastic tilt stand. I strongly recommend that you do not use it as you will soon break it. I reassembled mine and I will never open it again. I did not count this against the rating of this product as the other aspects of this case and battery pack design and performance are exceptionally good and I would never use the tilt stand in my daily use.

When you want to charge your phone just press the button on the back of the case for 3 seconds and you will hear your iPhone beep. When the iPhone battery is full the charging will stop. If you want to check the charge status of the battery pack then press the same button for 3 seconds and the LEDs will light up for 6 seconds to show you the charge remaining in the case battery.

You should note that I did not operate my phone 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.

Anker 2400 Battery Case Test:

Charging an iPhone 5S at 11% with the battery case fully charged 4 LEDs.

* 30 min iPhone at 43% battery 4 LEDs

* 60 min iPhone at 77% battery 2 LEDs

* 90 min iPhone at 100% battery 2 LEDs

89%x1560mAh=1388.4mAh

Charging a 2nd iPhone 5S at 19% with the battery case 2 LEDs remaining.

* 30 min iPhone at 37% battery dead

18%x1560mAh=280.8mAh

Test summary:

* 1388.4 mAh + 280.8 mAh = 1669.2mAh/2400 mAh = 69.55% efficiency

The battery in this case is a 2400 mAh lithium polymer battery and as you can see I tested it to be 69.55% efficient and this is a good result for this size of battery. This means that you can charge your iPhone to 107% of a full charge using this case. You can also see that the iPhone increased its battery charge quickly at a rate of 20 to 30% for every 30 minutes that the case battery was turned on. You can also continue to use your phone while it is charging. That is great to do without the use of any cables!

Don't forget to plug your headphones onto the extender cable and just carry them that way. Now you can make sure that you can properly plug them into the iPhone at any time. I liked this case a lot except for the flimsy tilt stand. I rated this battery case as a 5 star product. The battery is great, the case is nicely designed and all of the controls and jacks for your iPhone are accessible. The case comes with an 18 month warranty.

I was supplied a sample of the product for test and evaluation and I promised to provide a fair and honest review.