This is a great little "cobbler" for connecting up your micro:bit quickly. Works well with USB breadboard power supplies. See my blog post http://www.smythe-consulting.com/2017/04/driving-adafruit-4x14-segment-i2c.html
Part of our range of micro:bit accessories and add ons, this allows you to power your micro:bit and protect it at the same time, while leaving the edge connector fully usable. This case is made up of acrylic layers and a PCB which wrap around the micro:bit leaving the edge connector exposed but giving you access to 2 AAA batteries without the need for cables..