I bought Nokia's portable USB charger DC-18 a few days ago I would like to share my experience for those who are thinking about buying it.

The design is great as you can see from pictures. Build quality for its price is also good but everything else could be better. Charging it takes approximately 4 to 5 hours. Not a dealbreak but in case you are sometimes in hurry it can be useless if you cannot charge it quickly.

The biggest problem is efficiency. It has 1700 mAh, my Lumia 820 has battery of capacity 1600 something. Most recently I started charging my Lumia which had battery on 35% (no WiFi, mobile data on) from fully-charged DC-18. Charger managed to charge my phone to 87% which is not so great. It was also pretty hot.

The DC-18's charging cable is quite short (around 3 cm). I would certainly welcome at least twice as long.

If you have any question, post them and I'll try to answer.

Here is product's official website - http://www.nokia.com/gb-en/accessories/accessory/dc-18/