Most helpful positive review
95 of 97 people found the following review helpful
Works well but does not charge all cell phones
on March 18, 2011
This charger is very compact, accepts 110V to 240V (with plug adapter needed for overseas), works very well, charges up to 4 devices that take up to standard SUB-allowed 500mA current, and supposedly alternatively one device that needs more juice (not tested by me). However, it will not work with most of the non-smart phone devices. I did try it on three different brands of "classic" Motorola phones, and none of them worked. It does work on the newest models though, as well as on all "iProducts" we have at home, and Amazon Kindle. Of course, you need to buy the USB cables separately. On the side note, I purchased one more of a different brand and I am missing there the blinding bright blue LED light that this device has reassures that the device is powered. So I do like this design with LED unlike some other reviewers.
Now a little theory behind USB and USB chargers (source: USB.ORG, Web page at [....]). Originally according to the USB standard a USB device could draw only 100mA unless it negotiates with a computer and is allowed to draw up to 500mA. In June 2007 a new standard for USB chargers was drafted. This standard allows devices to detect, if there is a computer on the other side or just a power supply. If there is no computer, then they are allowed to assume that this is a USB charger. Devices that were designed before that date even if they were manufactured later would not charge from this charger at more than 100mA (charge slowly) if compliant with USB standard. Fans, keyboard lights, mug warmers etc., that are called USB decorations would not have that circuitry to negotiate the current and in extreme cases could even damage a USB port on your laptop.
This charger provides up to 2000mA total for all four ports. iPad and Barnes and MiFi 2200 would take more than 2000mA when charging and thus would be on the borderline of what this charger could deliver, if not slightly above (source: "Watt to Know About iPhone & iPad Power Adapters | Analysis". The Mac Observer. Retrieved 2011-12-12). Noble Nook draws 1900mA and could be charged as the only device connected (source: "Nook Color charger uses special micro-USB connector". barnesandnoble.com. 2011-07-03).
UPDATE: On May 8, 2012 I upgraded my rating for 4 to 5 stars. Since I wrote my review I have only one older cell phone in my household that would refuse to charge. The new problem that started showing up is low durability of cheap third party USB charging cables, but that is not related to the charger. Also, I have bought two more chargers. Still I do like to have the mentioned before LED indicator even though it sure is too bright in bedroom setting at night.