A:AnswerIt comes with a short USB cable you can use to charge the battery or its devices. Disregard the answer about it being a 1 amp cable... The cable's amperage is whatever block or device it's hooked up to.
A:AnswerIt depends on what device you're charging or what load you have on it. It'll charge any phone to full power, multiple times. I hope this was helpful.
A:AnswerThe button is only there to check the battery state. It doesn't do anything else. I would recommend charging the battery completely first. Once to connect your phone to it give it a minute. It detects devices and will then begin charging automatically.