How cool is this little gadget? Keep your phones, tablets, blue tooth speakers, Go Pro cameras and other portable usb devices charged and non the less at the flying field and on the go, on the bus or airport at the park or anywhere you are.  Never worry about having to plug into an outlet again with this cool tiny device.  I have tried it with 3s, 4s and 6s, this thing charged my iPhone and iPad with ease.  I prefer my self using 3 or 4s lipos, cause that's what i have.  I put in series two 3s to test its function and it works on 6s as well.