TeckNet iEP517 Power Bank 5200mAh backup battery pack – Review

TeckNet iEP517 Power Bank 5200mAh backup battery pack   Review

Batteries are a contentious issue when it comes to smartphones. It seems that no matter how much the phone technology advances, batteries can only just keep up. One day on a full charge is normal but, quite frankly, unacceptable.

There are various options available to ease your power struggles: from shells that one puts standard AA batteries in, to moulded phone cases which have batteries built in that clip over the back of the handset. In my opinion though, a generic rechargeable battery pack that can be used for any device is the only sensible option.

Backup battery power packs are becoming more and more popular these days. The sheer amount of portable tech we carry about means the likelihood of getting caught with a flat battery is greater than ever. To that end, rather than carrying spare batteries for every phone, tablet, GPS, etc. the battery pack is an ideal cure all.

Cue the TeckNet iEP517 USB 5200mAhPower Bank.

Good Points

  • Capacity to price ratio
  • Charge level indicator
  • Torch

Bad Points

  • No Lightning adapter
  • Felt bag sheds its skin!


  • Capacity: 5200mAh
  • Type: Lithium-ion
  • Input: 5V, 1A
  • Output: 5V 1A
  • Life Cycle: 500 charges
  • Size: 100 x 23 x 45 mm
  • Weight: 123g
  • Best price: £13.97

What’s in the box

As well as the unit itself there’s a USB to micro USB cable, a micro USB to Thunderbolt adapter, instruction booklet and a felt, drawstring bag to keep it all together.

As you can imagine, a box with batteries in and a couple of connectors really isn’t the most stylish gadget, however, TeckNet have done a nice job of the design. The smooth, shiny plastic casing and multicoloured status LED lend it an air of class. I opted for a white one so it would be easy to find in my bag, but there is a black version available.

TeckNet iEP517 Power Bank 5200mAh backup battery pack   Review

In use

The first thing that’s needed is a full charge. Ironically, for this one requires a mobile phone charger or a computer with a USB port. Simply plug it in and the LED will start to flash. If it’s between 0 and 33% full it’ll flash red, 33 to 66% it’s flash green and 66 to 99% it’ll flash blue. Once fully charged the blue light will stop flashing and stay on until unplugged.

A nice little feature is that if you need to see how much charge the iEP517 has when not in use, simply press its button and the LED will display red, green or blue.

TeckNet iEP517 Power Bank 5200mAh backup battery pack   Review


The manual states that a full charge will take six hours from a phone charger and seven hours from a USB port. I tested both methods and found the phone charger method to be about right at six hours, but my PC’s USB 2 port took nearly nine hours to charge it.

I then set about charging various phones with it. The test required charging each phone from 10% to full.

Each handset was soft rebooted before being plugged in. They were then left on with the screen off. They had good mobile network signal, wi-fi on, and GPS off. Twitter and email clients were set to synchronise every five minutes. The iEP517 was recharged fully between each test.

Test results

Handset Time taken to charge
LG Nexus 4 (2100mAh) 2hrs 30mins
Samsung Galaxy Note II (3100mAh) 3hrs 15mins
Huawei Ascend G300 (1500mAh) 2hrs 5mins
Nokia Lumia 520 (1430mAh) 1hr 50mins

Whilst observing the same test conditions I also charged my Nokia Lumia 520 from 8% to full, then my Note II from 8% to 62% before the iEP517 gave up.

N.B I’m afraid I don’t have an iPhone, so I couldn’t do that test, however, the figures above should give a good indication of how it would perform on an iPhone 4S’s 1432mAh battery. (Why a 4S? It doesn’t come with a Lightning adaptor, only Thunderbolt.)


The iEP517 also doubles as a torch! Click the button on the side twice and an ultra-bright LED comes on at one end. This is a stroke of genius given its size and shape, as it makes it the perfect handbag companion, performing dual emergency functions. And yes, it will still charge a phone at the same time.

TeckNet iEP517 Power Bank 5200mAh backup battery pack   Review

Now then, this felt bag; it looks rather classy, and would be a nice little finishing touch, except for the fact that it sheds black dust everywhere. It’s meant to protect the battery pack from dust ingress, not cause it!

TeckNet iEP517 Power Bank 5200mAh backup battery pack   Review


I’ve put the iEP517 through its paces over the past few days and it’s impressed in every department. It’ll recharge two average size phones whilst they’re on, on a single charge and light your way down a dark ally at the same time. All for £13.97 including delivery. If it came with a Lightning adapter and a bag that didn’t shed like a snake with dermatitis, then I wouldn’t be able to fault it.

The price shown above is at the time of writing, and is available on Amazon

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  • weirdstuff

    Only 500 charges? So it’s going to start deteriorating in 18 months? Little bit disappointing, but then again the price is a plus point…

    • AC

      As a backup charging device, I’d guess that it wouldn’t be used every day. In my case, I’ll probably use it once a week or so, meaning it should hopefully last a good few years.

  • AC

    Thank you very much for this excellent and detailed review. I bought one immediately after I read the review. I already have three others, one of which is from a high street store but the worst one of the bunch, and the most expensive. This one is the best by far, charges at the speed of a wall-output, (the high street one also states 5V and 1A output but is detected by my phone as a USB charger and is extremely slow – around 20% per hour during no use. I have returned it to the store).

    Again, excellent quality review, thank you :)

  • Dom Barnes

    I think you mean dock connector, not Thunderbolt. That’s what’s on the Macs