An external battery for your smartphone! 

After discovering very recently the RAVPower series of products (read RAVPower charger 4 Ports USB 30W/6A), I have decided to test a new product : an external battery for smartphones. On my side, I have an iPhone 5S, and I must recognize that the life of the battery is very short ... Who never found destitute after a busy day and did not had his smartphone flat. If you must spend a day taking pictures, using GPS, and you still need juice, here is a great item. I must say that I found the rare item that I was searching for a long time, so I can not resist to present you the video of the LUSTER 3000 mAh battery from RAVPOWER :