ITgut® X-Power ultra portable 8000 mAh Powerbank Dual USB (2.1A / 1.5A Output) 5V Back Up Battery Pack for Android Phones, Go Pro; iPhone 5, iPad 4, iPhone 4S/3GS/3G iPad 3/2; Samsung Galaxy S4, S3, S2, Galaxy Ace, Galaxy Tab, Galaxy Note 2; HTC Sensation, One X V S, Desire C S X, Wildfire S; Google Nexus 7 Nexus 10; Nokia Lumia 920 800 900 N8; Motorola Razr; LG Optimus; Blackberry Z10; Sony Xperia Z

Bought this for £3.99 and at that price, this is great value. Takes 7100mAH to charge, and puts out just shy of 5000mAH at 1.5A.My only gripe would be voltage drop on the output - both ports seem to suffer quite a big drop, and the 2.1A port is actually slightly worse which is odd. Perhaps it has higher current/lower drop once it negotiates with the device, although I didn't find this testing with my Pixel XL. It tends to drop at anything over 500ma, to 4.85v at 0.85A all the way down to 4.66v at 1.55A, which isn't great for a port supposedly rated at 2.1A.It's quite small, although slightly bigger than the Xiaomi Mi Power Bank 10400mAh, while having slightly lower capacity. This is probably owing to the Xiaomi having more advanced battery technology in it.Overall, if you can get this for under a fiver then I'd go for it.

At £3.99, it was a bargain. Looks and feels well made. Can charge my phone twice (while also using it) which is more than good enought for what I needed

Seems ok for what I paid.No complaints from me

Excellent for the price

Only charges up to 3 of the 4 light , powerbank won't charge to 100%

Very good power bank it is amazing

This is my review of the ITgut X-Power Ultra Portable 8000mah external battery. I will start off by making some things clear upfront:1. I was not paid to write this review, nor have I been sent a unit to review by ITGut. I bought this powerbank with own money.2. This review is completely honest.3. This review is based on my personal opinion and experience with this device.I’ve only recently found the need for a powerbank and after a quick search I across the ITGut X-Power Ultra Portable. As this powerbank is a little smaller in capacity to some others that I have seen, I was a little sceptical about its possible perforance - at the bargain price of £9.99 it wasn't going to break the bank.The device arrived on time and is presented in a good quality packaging which was quite reassuring.BUILD QUALITYI was quite surprised with the the build quality of the unit which is a solid single-body that consists of a hard plastic-like case and not one that is likely to break quickly.WEIGHTIt’s not a particularly large pack, and was actually quite light-weight. The powerbank fits neatly into my inside suit jacket pocket and didn't really weigh the jacket down (at 186g its slightly heavier than my iphone 6s).CHARGING SPEEDSI was actually quite surprised of the speed in which the battery pack charged my iPhone 6s. I was able to charge my battery from flat to a hundred percent in less than 2 hours. This was quite impressive. In fact to get the my phone to about 27 percent took about 15-20 minutes which is enough power for the phone to last for a good few hours. I've not had to try it with other phones, so not sure if the charging is slower/faster in comparison. There are two USB ports on the device each offering 3.1A per port which is not bad, so you could charge two devices at the same time if needed. I'm not sure how much this would slow the recharge time to though.OVERALLHaving used the device for a few weeks, I have to say that I am impressed with it and would recommend it.