Worked well for a while, but now it doesn't charge anything anymore. I bought this at the start of February 2017, and now the start of June it no longer works. When the button is pressed, the four blue lights turn on indicating that it is fully charged, but when I plug an iPhone cable in without the phone attached the lights flicker and only the left most blue light turns on and blinks. When I attach my phone to the cable it doesn't show that it is charging. The built in flashlight still works. I don't know what's up with it. I'm going to try to drain the batteries down by leaving the light on. Maybe the circuitry is detecting an overcharge situation of the batteries and is not allowing it to charge any devices for safety? I don't know.

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I'm going to edit this review after receiving a lightning fast response from the Aukey support team. Wow that is the fastest response I've ever received from a company! I am so glad that they fully support their products. Even though this unit stopped working, it gives me confidence in continuing to purchase Aukey products in the future!

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EDIT 2: I received my replacement power bank, but after a few weeks of charging my iPad, the replacement bank has stopped working too! It shows all four blue lights lit when the button is pressed indicating a full charge, but when I go to plug in my USB cord, only one LED is lit and blinks with no charging status on the iPad. I'm going to contact them again to see if they will replace the replacement!