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TeckNet� iEP392 12000mAH Heavy Duty 2.1A/1A Dual USB Ports External Battery Pack for the new iPad 3, new iPad mini, iPad2, iPhone 5, iPhone 4S/4/3Gs/3G, iPod Touch all versions; Samsung Galaxy Note/Nexus/S3/S2/S; HTC Titan, Sensation, ONE S/V/X, EVO Thunderbolt, Desire; LG Optimus series; Blackberry Bold, Curve, Torch; Motorola Razr HD/MAXX & Bionic, Atrix/2; Nokia Lumia 700/800/900 and GoPro (iEP392 Heavy Duty 5V/2.1A/1A high speed charger)

by TeckNet

4.6 out of 5 stars See all reviews (144 customer reviews)

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12000mAh Advanced Li-Polymer Battery Technology, 43 hours movie time for iPhone 4/4S and 11 hours movie time for 3G iPad
Heavy Duty Dual Port USB Outputs: 5V 1A and 5V 2.1A, high speed charger, can charge two devices at the same time (Only one USB Charging cable included)
4 Integrated LED Power status indicator lets you know how much power is left, Turns off automatically When not used
With built-in safety circuit and heat-resistant design, Ultra light weight 300g, Dimensions: 108*105*23mm
Come with UK Power adaptor and a 7 set of changeable connectors, so you can power and recharge your for most Smart Phones such as HTC, Apple, Samsung, LG plus, any iPad, tablet, MP3 Plays or camera.

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Product details

Product Dimensions: 10.8 x 2.3 x 10.5 cm ; 299 g
Boxed-product Weight: 998 g
ASIN: B000X30AYA
Date first available at Amazon.co.uk: 12 Nov 2008

Average Customer Review: 4.6 out of 5 stars See all reviews (144 customer reviews)

Amazon Bestsellers Rank: 1,863 in Electronics (See Top 100 in Electronics)

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Product Description

TeckNet iEP392 USB Mobile Charger for the extra energy boost on the way

Small,compact lithium-polymer battery,the mobile devices can go give a second life

Nothing is more annoying,as noted at the end of the day that the phone does not work because the battery is empty,or to photograph a wonderful motive cannot,because the USB camera is not charged for too long. TeckNet iEP392 Power Bank are here to supply quick charging for USB-chargeable devices such as cameras,smart phones, tablets,headsets,and much more

TeckNet Power Bank has lithium-polymer batteries,guarantee many charge cycles and long energy storage. After six months they have no use for example,still well over 30% of their original charge.After completing a charge cycle off the Power Bank off automatically to conserve the internal battery and avoid wasting unnecessary energy. Integrated fuses prevent overcharging the battery or deflagration
-After 6 months,still over 30% of total capacity
-Turns off automatically
-Security:Integrated fuses and thermal protection design
-2 USB Output

Specs:
-Capacity:12000mAh
-Type:Lithium-polymer
-Life Cycle: 500

Battery Life Extension on Apple products:
-120% of the iPad battery life
-43 hours iPhone Movie Time

Compatibility:
-Apple:All iPad/All iPhone/iPod Touch/Nano/others
-Compatible with Many mobile phones,HTC,Samsung,BlackBerry,Motorola,Nokia,LG, Sony Ericsson ...
-Other tablet,NDS,MP4, MP3....
Incompatibility:
Not work with the device require USB DCP specification like Blackberry 9700,Samsung Galaxy Tablets,Nokia N900...

Box contains:
- 1 Battery Pack, 1 USB cable, 7 Connectors, 1 Bag, 1 Manual

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Customer Reviews

4.6 out of 5 stars

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Most Helpful Customer Reviews

59 of 63 people found the following review helpful

4.0 out of 5 stars Very good, but doesn't deliver 12,000mAh 31 Jan 2012

By A. Hawkins

Amazon Verified Purchase

This is, certainly, an amazing piece of kit. The amount of power it packs into a sleek case that will fit in the back pocket of your jeans is truly impressive, and for the price (under 35 pounds at time of writing) it's an absolute bargain.

However, I do have one niggle: It wont provide 12,000mAh.

Now, I have to say that I'm using this for a totally unsupported purpose; namely, to run a set of LED bike lights. Two sets, actually. The stock battery that came with each was a 6V / 2,400mAh unit of nearly the same size and weight as this TeckNet unit, so this will run twice as many lights for far longer without a weight penalty. Happily the 6V lights work perfectly on 5V or 5.5V, so a minor adaptation of a USB cable and hey presto, one of the best bike light batteries you could wish for.

This in turn led me to my findings about its usable capacity. The lights draw about 550mA according to my multimeter. A quick bit of maths should tell you then that a 12,000mAh battery should run the lights for about 22 hours between charges. In fact, the run time is about 14 hours (yes, I know, still longer than any night ride!), meaning about 7,700mAh of usable capacity.

I questioned this with the seller and very promptly they replied and reminded me about the inefficiencies of charging batteries; when you charge a battery it gets warm as, while most of the power charges the battery, 30-40% will be lost as heat. Which is fine, except, (a) I wasn't charging a battery, and (b) I was measuring the current flow from the battery to the load. What it did when it got to the load, I have no care (and neither does it), the point is that the battery put out 550mA for 14 hours before it became sufficiently discharged to turn itself off....

I suspect that the truth may have more to do with the clever electronics inside the unit. The instructions say that the output is shut off when the battery voltage drops below a certain value; my suspicion is that this value is reached significantly before the actual chemical cells are exhausted. In other words, the cells may well have a 12,000mAh capacity, but the electronics prevent you from getting much more than about 60% of that capacity out of them. On the plus side, those clever electronics keep the output voltage constant throughout the discharge, as is required for a USB supply; this means the lights stay on full brightness until they switch off.

I have no reason to believe this discrepancy is unique to this battery; it wouldn't surprise me one bit to learn that all similar batteries did the same, and, had I only ever used this to keep my phone charged when away from the mains for long periods, I'd probably never have discovered any of the above, and I'd have nothing but praise.

Speaking of which, I am buying a second one, for its advertised use this time, because despite the above niggle, the capacity/size/weight/price combination of this thing is still amazing - just be aware that the quoted capacity does not reflect the usable power while you're adding up what you want to charge or run from it.

*****
Later edit:

As some others have pointed out (below), the mAh rating applies to the chemical cells, which, being LiPo, output 3.7V. This gives a "true" output of 44.4Wh which is marked (in tiny writing) on the battery itself.

Convert the voltage to 5 or 5.5V for USB, and this power rating gives around 8,800 or 8,000mAh at the actual output voltage (minus whatever inefficiencies the voltage conversion introduce), in line with my findings above. It's a niggle / annoyance that this battery (and probably all similar LiPo USB-voltage packs) is sold quoting a mAh capacity that cannot be achieved at the supplied voltage. It's like saying my car can do 100mph and 100mpg - it can, but, not at the same time!

Still a great piece of kit and still highly recommended, just a shame batteries like this aren't sold quoting the Watt hours which would give a much more accurate customer expectation.

Sellers *please* take note!

:) Read more ›

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17 of 18 people found the following review helpful

5.0 out of 5 stars The product works great with my ipad 18 Jun 2011

By marla heasley

I ordered this TeckNet iEP390 battery pack a few days ago and I have to say it's a great travel tool! I have an iPad and I tried a couple of other battery packs but they all failed to properly charge it. None of the other batteries could provide enough power to the iPad and it would charge way too slowly. With the TeckNet iEP390 it charges really fast! I think it might charge even faster than from the wall outlet. Also, none of the others had even close to the same 11000mah capacity for the price. You definitely need the extra juice to charge a tablet. For phones, I was able to charge my iPhone several times over.

It comes with several tips so you can charge just about anything. My brother has the Galaxy tab and he said he had the same problem of other batteries not working. I used the included galaxy tab tip and his charged perfectly.

The size is not bad either. It's a bit heavy, but only a bit bulkier than an iPhone. People always ask me what it is since it looks so shiny.

I would highly recommend for anyone who needs power while traveling. Good to charge anything I could throw at it.

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5 of 5 people found the following review helpful

5.0 out of 5 stars TeckNet iEP392 Li-Ion battery bank 3 May 2012

By Grumpian

Amazon Verified Purchase

I bought this battery bank for �33.98 on 31.Dec.2011, having decided to treat myself to a second model in addition to a Sanyo Eneloop KBC-L2B. I had bought the Sanyo for their excellent reputation in batteries; I opted for the TeckNet iEP392 for the lower price after reading favourable reviews on Amazon.

The battery bank arrived on 25.Jan.2012, slightly ahead of Amazon's estimate. A nice surprise - it looks better in reality than on the picture, made of black glossy plastic with a curved silver trim at one side of the top. Under the silver trim (which turned out to be semi-transparent) are four blue LED lights to indicate the level of remaining charge.

The iEP392 feels solid and well built. It is chunky and would be an overkill to carry around in your backpack in the city, but would be very useful for trips to regions without electricity, long flights with your iPad, or simply to be able to charge several USB-powered devices while traveling. It can charge two at a time.

The battery came in a fairly large box that contained also a UK mains charger, several different connectors and a nice cloth pouch. It was about 75% charged (three out of four indicators lit), so I topped it up to 100% before use. Then used it to charge my Blackberry twice over a week. Still four indicators lit! This thing appears to have some serious capacity, as it claims.

Three months later, it has been to Morocco and back, but apart from that I have not used it heavily. After 4 charges of a Blackberry or an iPhone the remaining capacity was over 50%, so in theory it should manage about 8-10 charges of a smartphone.

I haven't done a proper test of the capacity, but came across another reviewer's comment that he measured it at 7700mAh.... This will be correct if the quoted 12000mAh capacity applies to the actual lithium battery inside the device, which has nominal voltage of 3.7V and not to the 5V USB output. To provide a given current at the 5V USB output, you need to draw higher current from the 3.7V battery. Also, since the electronics that convert the voltage from 3.7V to 5V are not 100% efficient (more likely 85-90%, say 87%), the current drawn from the internal battery needs to be even a little higher. Simply put, it has to be 5/3.7/0.87 = 1.55 times higher at the battery than at the USB output. Divide 12000mAh by 1.55, this is about 7700mAh, therefore the observed capacity sounds about right. Still, this is a very high capacity for a portable power source.

The iEP392 is intended for indoor use, but I suspect that with some improvisation to keep it dry (watertight food box with a clip-on lid?) it could even be used outdoors. Just be very careful not to hit it hard or make it wet, ever. The electronics may fail, and lithium-ion batteries can ignite if short-circuited.

The risk of self-ignition of lithium-ion batteries is very low in normal use, but there have been a few such cases globally. That is why such batteries should be carried in the cabin baggage on a plane. Where you would need a mobile power source anyway.

Comparison with the 5000mAh Sanyo Eneloop Sanyo Mobile Booster KBC-L2B:

- The weight is proportional to the capacity: the Tecknet is 12Ah and weighs 300g, the Eneloop is 5Ah and weighs 140g;

- Both are solidly made with a nice design. The Tecknet is glossy black, the Eneloop is glossy white;

- The Eneloop's charge indicator is unnecessarily fiddly - you have to press the button for 2 seconds, after which the single blue LED flashes in a series to indicate the level of remaining charge. TeckNet's solution is simpler - press the button, one lit LED means about 25% charge, two - 50%, three - 75%, four - 100%;

- When left on without a load, the Eneloop shuts down after twenty seconds or so. The Tecknet is said to have a shut-down time of 1 hour. Most likely the electronics inside have low self-consumption without load, so this should not be an issue, especially given the high capacity;

- With the TeckNet iEP392, you get 2.4 times higher capacity at a slightly lower total price than an Eneloop KBC-L2B, which costs over �40. So, in terms of capacity per pound, the difference is nearly three-fold;

- iEP392's manual recommends to discharge and recharge the battery once every 5 months to prolong its life. I can't remember whether the Eneloop's manual contained similar advice (will check if I find it)

- Regarding durability - re-visit this review again in a few years!

The TeckNet iEP392 is now a permanent addition to my travel/emergency gadget pack along with a torch, a compass, etc., while the Eneloop KBC-L2B, being smaller and lighter (and white), is being carried around by my wife as a portable source for her power-hungry iPhone 4S.

Imagine your trans-ocean flight being delayed due to snow at Heathrow and you arriving hours or days later with a completely dead mobile phone, not being able to call whoever is meeting you. It may happen only once, but even for that reason alone it is worth to carry a small power pack, say 2-3000mAh. The iEP392 with its high capacity is fit for this purpose and many more, and offers excellent value for money. I hope it lasts, too. Read more ›

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5 of 5 people found the following review helpful

3.0 out of 5 stars iep392 22 April 2012

By Ron Doyle

Amazon Verified Purchase

I purchased the unit two weeks ago and noticed that the port markings were upside down making the tablet and phone ports opposite to what they should be. After many emails to TeckNet I was told that the whole batch was wrongly marked but the battery was functional regardless. I decided to keep the battery as to return it was at my expense.
The battery, I found, delivers about 70 percent charge for the new iPad so not bad. I have had many purchases from TeckNet and always found them good quality, time will tell on this battery.
Make sure the price quoted is what you pay.

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Most Recent Customer Reviews

5.0 out of 5 stars the best external battery I've got

I got this long long ago, and the truth was the best proof that this battery is really powerful. It offered my phone and pad continuous power in several days without charging... Read more

Published 4 days ago by I am sad,that's it

5.0 out of 5 stars satisfied

It is a good product. It has good quality and it is well made. It would be better if it had larger capacity.

Published 18 days ago by ecloud

5.0 out of 5 stars Excellent product

I brought this product for a friend who does a ridiculous amount of travelling and he hasn't stopped raving about it. I would definitely recommend it.

Published 18 days ago by T. A. Houldsworth

5.0 out of 5 stars Nice Product!

I am very pleased with this product. It holds it charge well when not in use, which is often a problem with this sort of product. Very Pleased

Published 18 days ago by Stew

5.0 out of 5 stars TeckNet iEP392 12000 external battery

I bought this for when we go on holiday and am delighted with it. It comes with several different connectors which I have used to charge ipads, ipods, ipod nano, samsung phones,... Read more

Published 21 days ago by Sassy Lass

5.0 out of 5 stars Excellent item!!!!!

I purchased the external battery pack for use with my iPad and must say it's an absolute god send!!! Read more

Published 24 days ago by SUTT74

5.0 out of 5 stars Excellent value, works well with all the devices we've tried

I bought this as a present for my partner, who wanted something small enough to pop into her bag to ensure she had backup power available should her phone run low. Read more

Published 24 days ago by Stephen

5.0 out of 5 stars handy piece of kit

I purchased 2 of these at the end of last year, one for my daughter who doesn't have a working cigarette lighter in her horse lorry and one for myself as I work away from home a... Read more

Published 24 days ago by JLW Dorset

5.0 out of 5 stars Useful for Travelling

I bought this for powering my IPad and IPhone when travelling. It managed to keep both devices topped up throughout the whole day from leaving Heathrow to landing in Buffalo... Read more

Published 26 days ago by Stuart O'Hara

5.0 out of 5 stars Does exactly what its intended to do.

Was very pleased with the product, manage to get a couple of charges of the ipad and a few on the phone. would highly recommend.

Published 27 days ago by Ajf322

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