KiwiBird® 12000mAh External Battery Double USB output / Universal Portable Power Bank with LCD and LED Flashlight for iPhone 4 / 4S / 5 / 5S / 5C, iPod touch / nano, iPad 2/3/4 / Air / mini / Mini with retina display and Samsung Galaxy S2 / S3 / S4, Note 3.2, Tab and PS Vita, GoPro | External Backup Battery Charger for Apple and Android smartphones, tablets and USB --other devices - Blue + Pink (Electronics)
Easy to use, compact, and a nice look, this battery allowed me to gain autonomy over the use of my phone and i-pad in my displacements. I highly recommend it.