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Anker Astro Slim2 4500mAh External Battery

Anker Astro Slim2 4500mAh External Battery

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Product Description

Our goal was simple: design a powerful battery that stacks up – literally.

Slimmer and stronger.

At (0.39in), Anker's Astro Slim2 comes with enough power for 2-3 charges on most smartphones in a compact, easy-to-grip case. Sized especially to stack behind your 4.3in smartphone for uninterrupted phone-use while charging. An LED column lets you know just how much juice is left without diverting attention from your work.

Say goodbye to knots.

Who doesn't hate tangled cables? With an intuitively-sized micro USB cord for Android, the Slim2 allows you to carry your power all-in-one. Using an iPhone? Plug into the USB port and charge up via your OEM cable.

No expense to speed.

What's better than a high-capacity battery that slides into your pocket on-the-go? One capable of simultaneous, full-speed charges. Both ports supply 1A of power with complete safety to your phones, so you can power up in no time and make the most of your day.

Customer Reviews

George Wells
  • I received the Anker last week. I used it ...
  • I received the Anker last week. I used it to charge my Samsung phone. I did not encountered any problem/s. Thanks for your product. 5 star rating.
  • 2014-10-29

Newport
  • Perfect
  • Great mobile phone battery charger. Works perfectly with my HTC Desire.
  • 2014-10-18

Amazon Customer
  • Good quality and great prices
  • Lost my first Anker and replaced it with another. Good quality and great prices.
  • 2014-10-17

Bryan Day
  • Perfect Balance Between Capacity and Usability
  • I've had a few external battery packs over the last few years. The Anker Astro E3 10k (which I currently have and love for its capacity) and a few others. All of them suffered 2 flaws in my go-to use case- Had to use a separate cord to charge devices, which meant carrying around a cord and possibly having said cord be damaged when in use and in a bag- Be too large and/or bulky to carry around in a pocketThe Slim2 Solves both of these issues. I can easily pocket this device (front or back pocket) and have it ready for use if I don't have my daily bag with me (late nights out whaaaat?). As much as i love the E3 it's a bit bulky and cumbersome when I carry it by itself. The Slim2 also satisfies my desire to not have to carry an extra cord. Neatly tucked away, the cord is there, when you need it. Granted, I have a Samsung Galaxy S5, so i can use the built-in micro-usb. I also like how it detects when plugs in and doesn't have to be manually turned on.I chose the 4500mah version since i usually have my E3 10k with me if I'm traveling so this serves the purpose of a 1-1.5 charge item that i can make it through a day or weekend with if I don't have a charger available. As crazy as that sounds, it happens.Definitely recommend this for anyone looking in the 1-2 charge range. Larger devices are out there for 5+ charges worth of capacity, but this isn't looking to suit that need. Plus, cable not needed!
  • 2014-10-14

Bill in CowTown, CA
  • Great product. Simple to use
  • 2014-10-10
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Customer FAQ

Q1.  Can I use a different USB cable rather than the cable that comes with the Astro Slim2 4500mAh external battery?
Yes, you can use other cables. However, to ensure compatibility and best performance, we strongly recommend using your device’s original cable, a third-party certified cable (such as MFI) or the included cable.
Q2.  What kind of wall charger should I use to charge the Astro Slim2 4500mAh external battery?
The battery can be recharged from any computer or laptop USB port or any USB AC adapter.
Q3.  What devices are compatible with the Astro Slim2 4500mAhexternal battery?
The battery is compatible with most Android, Apple and other USB devices.
Q4.  Does the Astro Slim2 4500mAh work with the new iPhone 6 and iPhone 6 Plus?
Yes, but the Apple cable is not included. Please use your device's original cable.
Q5.  Will the supplied Micro USB cable or the built-in cable compatible with the Micro USB v3.0 devices, such as Samsung Galaxy S5/Note2/Note3?
Yes, take a close look at the port and you will see the port is divided, insert the none Micro-USB 3.0 plug to the appropriate side and it will work fine.
Q6.  What's the output efficiency of the Astro Slim2 4500mAh external battery?
The efficiency of this battery is around 70%-80%. The internal circuit board is 92% efficient, accounting for power lost through circuit heat and voltage conversion, which is up to 5% above the industry average. Energy is also lost within the charging cable and the device being charged (approximately 15-20%). Additionally, the efficiency can be affected by the cable length and the age of the device being charged.
Q7.  Can the Astro Slim2 4500mAh external battery charge other devices while it is being charged?
No.
Q8.  Can the Astro Slim2 4500mAhexternal battery charge two devices simultaneously?
Yes, it can charge two devices simultaneously. But please note that when using 2 output ports simultaneously, the total output current will not exceed 2A.
Q9.  What do the LEDs indicate when the Astro Slim2 4500mAh external battery is charging itself or other devices?
When the battery is charging your devices, the LED power meter will stay on, displaying the battery’s remaining power and will turn off when the device is fully charged and not drawing a current.

When the battery is being charged, the LED indicators will show charge level by staying lit; the flashing LED will show the portion of the battery currently being charged.They will turn off automatically once the battery is fully charged.
Q10.  How long will the charge in the Astro Slim2 4500mAh external battery last without being used?
Generally, the Astro Slim2 4500mAh external battery's static power consumption is lower than 100uA, which will take between 3.5 and 20 years to drain the battery completely. However, the chemicals within the li-ion battery will gradually become less active over prolonged periods without use. Most will die in 2 years of inactivity. To extend your battery's life, please discharge and recharge it at least once every 4 months.
Q11.  Can the Astro Slim2 4500mAh external battery be used for international travel?
Yes. Please be sure that the USB AC adapter is compatible with the voltage of the country you travel. The input voltage of an adapter is usually labeled on the adapter itself.
Q12.  Can the Astro Slim2 4500mAh external battery be taken on board airplanes?
Yes, all Anker external batteries including the Astro Slim2 4500mAh external battery can legally and safely be taken on board airplanes. Here are the relevant requirements:
Quoted from Federal transportation security rules (Effective January 1, 2008):

Lithium ion batteries (a.k.a.: rechargeable lithium, lithium polymer, LIPO, secondary lithium).
-Passengers may carry consumer-sized lithium ion batteries [no more than 8 grams of equivalent lithium content or 100 watt hours (wh) per battery]. This size covers AA, AAA, 9-volt, cell phone, PDA, camera, camcorder, Gameboy, and standard laptop computer batteries.
-Passengers can also bring two (2) larger lithium ion batteries (more than 8 grams, up to 25 grams of equivalent lithium content per battery) in their carry-on. This size covers larger extended-life laptop batteries. Most consumer lithium ion batteries are below this size.

Anker's largest external battery is currently the Anker Pro2 20000mAh (74 wh) which is lower than the above 100 wh limit.
Q13.  What should I do if the Astro Slim2 4500mAh external battery can not be charged?
Please try a different AC adapter and Micro USB cable to see if that helps. Email us at support@ianker.com during your 18-month warranty period if this doesn't fix the issue.
Q14.  What should I do if the Astro Slim2 4500mAh external battery can not charge other devices?
Please try a different charging cable between the Astro and your device. Email us at support@ianker.com during your 18-month warranty period if this doesn't fix the issue.

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Latest Post

Charging speed
I see this pack provide 2A of total output.  Can built-in micro usb cable output the total 2A?
Replies(2) Collapse Report as spam Oct 14, 2014 at 6:08 PM
Justin Rohr
According to the site above " Both ports supply 1A of power " which means that the cable will only supply 1A of power, although depending if they limit it, it could supply more as the pack supports 2A total
Reply Report as spam Oct 14, 2014 at 8:55 PM
ANKER Team


The Slim 2 has a max output of 1A and the output of the USB port and the built in cable is the same.
Reply Report as spam Oct 14, 2014 at 9:00 PM
For iPhone
Is there ever going to be one of these made in the lightning connector on it?
Replies(1) Collapse Report as spam Sep 15, 2014 at 12:59 PM
ANKER Team


Unfortunately not.

We're finding that built in cables are not what our customers are looking for, they prefer the option to plug any cable in the output ports.
Reply Report as spam Sep 15, 2014 at 8:30 PM
Nexus 5

Can anyone tell me if this is compatible with Nexus 5 and how many charges could I possibly get from it??...I couldn't see Nexus 5 specified anywhere. Thanks.

Replies(6) Collapse Report as spam Apr 27, 2014 at 5:35 PM
Serotheo

It's compatible, it just needs to have a USB cable, if it does it should charge off it - that's the rule for phones anyways.

It'll charge your Nexus 5 about 1.5 times.

It should be about 80% efficient at least so .8 * 4500 = 3,600 mAh+
So 1.5 charges, at least, and close to 2 (around 1.8).

Reply Report as spam Apr 28, 2014 at 12:11 AM
Fire and Ice

will work with no problems! 

Reply Report as spam Apr 28, 2014 at 1:31 AM
ANKER Team


The Astro Slimtalk will output only 1A. If your Nexus 5 require higher than 1A charging, I would suggest to get a different model that can output more than 1A like the Astro 3E, E4, E5 or the 2nd Gen.

Please let us know if there is anything else we can assist. Thank you.

Reference Ticket#712329 if contacting a CSR by phone.
Sunnie
AnkerDirect Customer Support
1-800-988-7973
Mon-Fri 9am to 5pm(pst)

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Reply Report as spam Apr 28, 2014 at 6:30 PM
Haninder Singh
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Reply Report as spam Jul 2, 2014 at 2:31 AM
ros
Quote From Haninder Singh: jhjdhsj
Reply Report as spam Jul 2, 2014 at 4:24 AM
ros
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Reply Report as spam Jun 27, 2014 at 1:04 AM
weight
What is the weight of the Anker® Astro Slim2 4500mAh ??
Replies(6) Collapse Report as spam Mar 9, 2014 at 9:30 PM
TechToyWizard
As stated on this page at the top under the heading weight it is 113g / 3.9oz. Did you have another question?
Reply Report as spam Mar 10, 2014 at 12:56 AM
IT Owl
Quote From gherardini: Man what kind of bread are you eating haha? Definitely not wonderbread :P Must be those fancy baked european loaves haha
Reply Report as spam Mar 10, 2014 at 1:08 PM
gherardini
No Wonder bread here. Just the kind that goes well with cheese.
Reply Report as spam Mar 10, 2014 at 1:18 PM
David Hocutt
Mine is so light I have to literally tape it down or it will float way. You have no idea how many times I've had to climb a ladder and pluck it from the ceiling. No, seriously...
Reply Report as spam Mar 10, 2014 at 7:15 AM
gherardini
113 grams? That's seriously lightweight, like a slice of bread....
Reply Report as spam Mar 10, 2014 at 8:59 AM
IT Owl
Weight 113g / 3.9oz
Reply Report as spam Mar 9, 2014 at 11:15 PM
too "clever" of a design
This is a great form factor for a charger product, but unfortunately Anker was a little too clever with the micro usb tether that comes out of the charger that you plug into your phone to charge it. The housing surrounding the port is huge relative to what a normal micro usb cable sheath is, and the micro usb male adapter itself isn't long enough, so it requires me to pull my case off my nexus 5 in order to charge it. I really wish Anker would have done more real world homework on this design; they would have easily seen that anyone with any case on their phone wouldn't be able to use it. My case is the google nexus 5 case and is only a couple mm thick so it's one of the slimmest cases around and it doesn't work. Other than that huge annoyance, the charger works as expected.
Replies(4) Collapse Report as spam Feb 21, 2014 at 6:56 PM
TechToyWizard
Here's the good news. Anker actively reads these forums and from first-hand experience I know they listen to reader feedback. You make a good point ... sometimes even the best companies can't think of everything until people like you point out areas of improvement.
Reply Report as spam Feb 22, 2014 at 1:30 AM
deeznutz
Nexus 5 owner here too using the same battery pack. However, I don't have a case on mine and the usb adapter fits. Sorry you have to take your phone out of its case every time you want to use this battery pack to charge it.
Reply Report as spam Feb 24, 2014 at 6:49 PM
Pavel Petukhov

Depending on your case, you cannot expect it to fit into each and every port. I believe there are plenty of rugged case that would allow you to charge your device unless it is taken out of the case. I have no problems with using this device to charge my Nexus 4 when in case. 

Reply Report as spam Apr 15, 2014 at 6:07 AM
Haninder Singh
555
Reply Report as spam Jul 2, 2014 at 2:34 AM
CHARGING CYCLES?
What are the number of charging cycles of this model and the astro slim 3? by charging cycles i mean how many times can it be charged and discharged?
Replies(4) Collapse Report as spam Feb 19, 2014 at 1:12 AM
IT Owl
Over 2000 time maybe twice that
Reply Report as spam Feb 19, 2014 at 1:41 AM
gherardini
Li-Ion battery performance is rarely specified over more than 500 cycles. Depends on how often you use it
Reply Report as spam Feb 19, 2014 at 3:10 PM
AnkerMember431
It should be 500 or more, it depends on how you use and charge it.
Reply Report as spam Feb 19, 2014 at 6:53 PM
gherardini
Or maybe it's just 500 or so, depending on how you use it.
Reply Report as spam Feb 21, 2014 at 10:54 AM
Nexus 4
Can anybody please tell me how many times can the astroslim 2 charge a nexus 4?
Replies(4) Collapse Report as spam Feb 14, 2014 at 5:52 AM
orthopaedicsurgeon
1.5 - 2 full charges, it will depend if you'll be using your phone while charging.
Reply Report as spam Feb 14, 2014 at 6:47 AM
IT Owl
Twice
Reply Report as spam Feb 14, 2014 at 9:43 AM
Manan Ghelani
What are the number of cycles for which we can charge and discharge it?
Reply Report as spam Feb 16, 2014 at 12:24 PM
Manan Ghelani
Quote From orthopaedicsurgeonWhat are the number of cycles for which we can charge and discharge it?
Reply Report as spam Feb 16, 2014 at 12:25 PM
my favorite.....
I've tried a lot of external batteries and i can tell that this is my favorite. very thin and light, i can do more that 2 charges to my iphone 5. love it!!!
Replies(2) Collapse Report as spam Dec 17, 2013 at 5:44 PM
xnap30
Thanks for the review. You're right about the charge. Should be able to charge an iphone at least twice to keep you going through heavy power use work days. Please contact anker support if you have any questions or concerns
Reply Report as spam Dec 17, 2013 at 10:09 PM
AnkerMember431
Yeah, I was thinking about getting it for me and Galaxy S3 because of its thinness and how much juice it packs.
Reply Report as spam Feb 15, 2014 at 11:26 AM
Slim and Easy
I used this on a recent trip to recharge my iPhone 4 twice from about 40%. It still had juice left after that. I had to use my own iPhone cable but I bet this would be perfect for Android users. It fits easily into a tight pocket in my travel bag. It recharges quickly. Really, what else could you want from a slim portable battery?
Replies(3) Collapse Report as spam Nov 6, 2013 at 2:50 PM
AnkerMember431
That is true, the only thing I have that is a concern is I think the plug that comes out to charge an Android is too big for my case. That's why I'm deciding whether to buy it or not.
Reply Report as spam Nov 6, 2013 at 4:57 PM
physicianheals
Quote From AnkerMember431: the slim size was such a big factor for me, I didn't mind using my own charging cable. Another option is to utilize another case/cover for your phone.
Reply Report as spam Nov 6, 2013 at 7:45 PM
AnkerMember431
That's true, I think I might get it and use the wire that comes with it. Is that not a micro usb as well?
Reply Report as spam Nov 6, 2013 at 10:35 PM
No charger
I didn't receive a charger with my Anker Slim 4500 power bank. Can I get a charger sent to me? Can I use another charger? Thanks
Replies(2) Collapse Report as spam Oct 31, 2013 at 8:57 PM
ANKER Team
The Astro Slim doesn't come with a charger as it can be charged with any USB power adapter or a computer or laptop's active USB port. Hope that helps!
Reply Report as spam Nov 1, 2013 at 3:42 AM
physicianheals
You can use any charger/power adapter as long as it supports USB charging. I use this Anker charger to power up my Anker Slim http://www.amazon.com/Anker%C2%AE-Dual-Port-Charger-Samsung-Motorola/dp/B00B8L36A6/ref=sr_1_3?ie=UTF8&qid=1383285115&sr=8-3&keywords=anker+charger
Reply Report as spam Nov 1, 2013 at 12:48 AM
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