There are many external batteries out there that can help you recharge your portable devices, and which one you choose will depend on your particular needs. This 3100 mAh external battery/charger is one of the smallest I’ve seen, both in terms of physical size as well as charge capacity. The battery looks similar in shape and size to a smartphone, although it is smaller than most smartphone models I’ve come across. The battery is charged from an USB port, and it comes with its own micro USB cable. You can charge it by plugging it into a spare USB outlet on your PC (slow), or by using one of the wall USB outlets from your cell phone or a similar device.

I’ve been able to use this battery to fully charge a Samsung Galaxy S3 phone and iPhone 4S. It took me a few hours to charge both of those devices. In order to charge an iPhone I had to use my own iPhone cable – Apple is very restrictive when it comes to allowing third party manufacturers using their proprietary designs.

Since this battery is very small it is ideally suited for an emergency backup charging. It can easily fir in your pocket along with your smartphone, although I wish that it came with a small bag into which to put it.

The battery is well designed and looks nice along with all of my other small electronic devices. There is nothing that looks or feels cheap about it, except perhaps the packaging that it comes in. It is hard for me to asses at this point how durable this battery is, but right now I am giving it the benefit of a doubt.