This supposedly has 1 amp per port. This is false, it does not. I have a Droid X and a Droid 2 in the house. It will not charge them both at once. They each require 850ma. It will however charge one of the Droids and one dumb samsung phone requiring much less current. This device is nice, but I wish it really pushed out 1A per port. It would work great for those who simply need to charge one smartphone and one device that requires less current, e.g. a bluetooth headset. A minor setback for me, but others may not be in the same boat. Griffin PowerBlock Dual Universal Charger for MP3 Players and USB Devices (2Amp - 1A per Port) (Black)
Some of the earlier reviewers complained that the charger is not powerful enough to recharge combinations of certain USB devices with higher than average power consumption. I wonder if they used the previous model of the PowerBlock. I tested this charger with all possible combinations of the three USB devices I use most: Kindle 3, BlackBerry Curve 8530, and iPod Touch 64GB. In all combinations I tested, PowerBlock worked fine charging the connected devices quickly.
I bought this PowerBlock Dual Universal Charger to run my HP Multimedia USB powered speakers but hoped to be able to run my iPad as well. The iPad uses a 2.1 amp charger and the USB powered speakers requires 1 amp.
I connected both the iPad and speakers to this charger at the same time and they both worked fine. I watched a video on the iPad while listening to the speakers at a high volume to determine if the charger can handle it. It not only handled the load without any problems, but it also charged up my iPad to a full charge.
I discovered that there are two versions of this PowerBlock Dual Universal Charger. This one provides 1 amp per USB port and the other one produces only 500 ma per USB port. The good one advertises the 1 amp per USB port capability, while the other one does not. Also, this one shows the 1 amp per USB port on its packaging and on the unit itself. By all means get this better one, not the less capable one, as it can handle more devices.
I travel a lot and needed a small lightweight USB charger that can power my USB speakers, which saves weight and space. This can help avoid paying overweight charges at the airport which can be quite expensive (some portable speakers have a heavy power supply or built-in rechargeble battery that you must carry around). Also, I like the fact it can handle an input of 100v-240v so it can be used in any country.
Update: My daughter liked this charger so well that she got one for herself to power her iPhone and HP USB Mini Speakers. These mini speakers produce great sound from the iPhone, and this charger will power the mini speakers and charge the iPhone at the same time.
When you receive this item, inspect the package carefully. What was sent to me (from Amazon) was actually the 1A (2x 500mA) version. The outer box was labeled as such (in the fine print), but the part number sticker on the box matched the SKU for the 2A version listed on my receipt. I took a gamble that it was a transitional packaging snafu and opened the box anyway. $17.30 down the drain.
I do not have any of the problems that other reviewers have listed due to a lack of power. My kids each use one of the connections to recharge their iPod Touches (4th Gen); we charge both of them at the same time. It works as it is supposed to, it is convenient, and the price is low. I am very happy with it.
I was concerned that the PowerBlock would not charge an iPad 2 and an iPhone 4 at the same time. The iPad requires 1.1 amps but the PowerBlock claims 1 amp per USB port. The iPad doesn't seem to care and charges fine, even while charging an iPhone 4 at the same time. That's all I need so 5 stars. It is a bit big but so is the Apple 10 watt charger and it only has one USB port.
I was looking for a power block that would allow me to charge my iPad 3G 64GB and Kindle 2nd generation at the same time. I will mix in my iPhone 4 at times as well. This block does all those things just fine and works as promised. The only thing is that it's footprint of course is a little larger than just a single power block for example that from Apple. I would recommend this for my uses as an item that works just as it should.
I've used this at work almost every day since mid-October 2010 with no issues.
I use one or both USB ports to charge an Android phone (2 or 3 different ones since I got it) and Motorola S7-HD stereo bluetooth headphones. I appreciate that the green LED power indicator is not death ray bright like some wall chargers but is plenty large enough and oriented in such a way (along an edge) that it can be seen from 2 sides.
If I had one nitpick, it is that some edges of device are relatively sharp. Being that this is a folding travel charger, I would use caution when letting this thing jumble around with items you may not want to get scratched.
That said, since I purchased this, I've gotten another as a gift for my brother and am considering getting another for myself next time I travel (so I don't have to remember to bring the one from work.) - Usb Power - Iphone Charger - Ipod Charger - Nano Charger'
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