Anker 2nd Gen Astro E3 10000mAh Portable Charger ?External Battery Power Bank with PowerIQ Technology for iPhone 6 Plus 5S 5C 5 4S, iPad Air 2 Mini 3, Samsung Galaxy S6 S5 S4 Note Tab, Nexus, HTC, Motorola, Nokia, PS Vita, Gopro, more Phones and Tablets ()
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Edit Please note this is for the older version, NOT for the new E version (despite what the Amazon page says). Also I corrected my maths, as pointed out by Ms L Atkins. Thanks for that, I missed out some brackets!
So how many times can you charge your phone? This battery is 70% efficient (nothing is ever 100%). According to their website (ianker.com) use this formula.
Capacity of the External Battery * 70% / Capacity of the Mobile Phone
So for my phone, HTC One V (1500 mAh battery) - (10,000 * 0.7) / 1500 = 4.66, or 4 full charges from 0% to 100% & 1 more charge from 0% to 66%
In testing I achieved 4 full charges from 0% to 100%, & 1 more charge from 0% to 54% before the Astro 3 was totally flat.
It took 2 1/2 hours to fully charge my phone using the S USB slot. It took 3 hours to fully charge my phone using the I USB slot.
(Using the wall charger that came with my phone, it takes 1 1/2 hours to charge my phone from 0% to 100%)
2 USB slots can charge up to 2A (@5V). USB Slot I is for Apple devices, USB Slot S is for Samsung (read Android) devices. Both slots work for any USB device I have tried that is 5V.
This also has a DC out slot that is switchable between 9V & 12V.
Your device will only draw UP TO the Amps that it is designed for. In other words if your wall charger is 1A 5V, it is ok to use this external battery, your device will only draw 1A. The external battery itself can supply up to 2A depending on your device, just make sure its 5V.
I also tried charging my netbook, an EeePC (1000HE) made by Asus, with an 8400 mAh battery that lasts for around 7 hours.Read more ›
It's advertised under false pretences though, and here's why:
This charger operates at 5v (because USB power is 5v). But the batteries inside the device are only 3.7v... and there's some booster circuit inside which boosts that voltage up to 5.
When the manufacturer says 10,000mAh, they mean 10,000mAh at 3.7v. This is confirmed, as they say they use 37Wh of battery. Trouble is, when you have to boost this voltage up, your 'mAh' rating drops by the same amount.
So the device is only really a 7400mAh at 5v unit. The 10,000mAh is pure marketing, because really the customer shouldn't have to know or care about the voltages of the internal batteries!!
It's not bad value for a 7400mAh unit - but buyer beware!
Very good build quality, battery cells, accessories.
Been going two years strong, no issues.
I've actually bought two more, and one of them was DOA.
That's when Anker really shined, with their incredible customer support.
You probably won't need customer support, but it's really reassuring they've got your back if you do.
I was dubious to begin with, but then I received a newer version of this item, and in fact, a better one.
I was very pleased, and I have now been using it for some time.
I will review both in one, so that this may help any buyers in the future.
THIS model, was brilliant, and just slightly larger than my iPhone 6. It was quite a bit thicker, but it was a manageable size. In the box, i received the charger, a lovely little bag to carry it around in, and the charging cable. There was also the instruction manual.
I carried this charger around in my rucksack, and used it on MANY occassions, and I must say, it saved me quite a few times!
The charging port for the device on this was the only let down, as it broke after a handful of charges.
ANKER then sent me this model: Anker PowerCore 13000 Portable Charger - Compact 13000mAh 2-Port Ultra Portable Phone Charger Power Bank with PowerIQ and VoltageBoost Technology for iPhone, iPad, Samsung Galaxy
ANKER resent this model, which was MUCH better quality (in regards to the charging port) And lasted even longer for charging. I managed to charge my iPhone six times EASILY, and still had power enough left.
It is a nice compact design, and has lovely blue lights that show you how much charge is left in the device. It has an on off button, which is actually very useful! This also came in the box with the charger, the lovely net bag to keep it in, and the USB cable.Read more ›
Most Recent Customer Reviews
I still use it to this day - highly recommend the newer versions obviously as this is no longer for sale. Read more
I use this all the time when on holiday abroad and it is excellentPublished 28 days ago by LiverpoolG
Have used this portable battery pack to get multiple mobile phone recharges during a day (I get just over 3 charges of my Nexus 5, including some use of my phone while its plugged... Read morePublished 28 days ago by Kristina
Fantastic power pack, had this for a good while now and it's still going strong.
Always handy to have, especially with the battery life of today's smart phones, keeps... Read more
Had this for a year or so, still holds a charge great on a normal smart phone battery can usually charge it 2 or 3 times from flat to fullPublished 1 month ago by Peter Chapman
What can I say, this portable charger is a grief saver when you have 3 kids all with tablets, all who refuse to charge them despite knowing you're going on a long journey!! Read morePublished 1 month ago by Bob
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