On long weekends of competition, performance, and convention classes, it is really easy to drain the power on your device(s).
Recently, we purchased an Unu Superpak Portable Battery. This device is amazing for charging on the go!
It eliminates the necessity of dragging cords, finding outlets, etc.
There are many different brands, styles, and price points available- but definitely look into it! It will make your life much more convenient!