Bests & Worsts Reviews from Amazon

I've used this a lot now - to charge my cell phone and my Kindle Fire. I noticed that while it does charge fast, the devices drain fast. I am now getting an error about the voltage being too high and it won't charge my devices anymore. It may work with other devices, but not my Samsung Galaxy SII nor will it charge my Kindle Fire. I'm a little concerned that it has damaged both devices. I had to replace the battery in my cell phone after using this to charge it. *UPDATE* After about 3 months, I plugged it in to charge it and it became very hot to the touch. The lights no longer come on, it won't recharge, and it no longer charges any device. I really wanted this to be a good product. *UPDATE* I received an email from the company offering to send me a replacement (without changing my review this time). I accepted, and I've received the replacement. I've upgraded my rating based on GREAT customer service. I like the product, and I hope that the first one was just a bad product and this one lasts longer than three months.