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(More customer reviews)Although the Amazon's product description says: "Newly released! Designed specifically for your Apple iPad," the product that I received certainly says and behaves otherwise. The plastic box that comes with it printed "Apple iPhone 3G Travel Charger", and the label sticker on the charger printed "For iPhone 3G charger, Input 100-240V, Output:5V DC 700mA." If the charger is indeed specifically designed for the iPad, it doesn't say so.
The original charger that comes with the iPad is rated 5.1V and 2.1A, and this charger is 5V and only 0.75A. The output current of this charger is way under that of the iPad original charger. I was running Pandora music app yesterday with this charger plugged in, and seeing the battery level dropped from 88% to 86% in 10 minutes. So the charging power was not even able to keep up with the burning rate (read on for a possible explanation).
After testing with several other USB chargers, ranging from 500mA to 2000mA (e.g., Tekkeon MP1800), I believe that the iPad has a mechanism to detect whether a charger is "acceptable" (as reflected by whether the "battery level" icon on the iPad is changed to a "battery charging" icon) and a separate mechanism to actually be charged. Some USB chargers are rejected by the iPad (either the iPad does not show the charging icon or the iPad may respond by saying "not charging" next to the battery icon. Some other USB chargers are accepted only when the iPad is on the home screen (i.e., without running an app). Once a USB charger is accepted, then it will normally charge the iPad (sometimes I have to turn off the screen to prevent the charging icon from quitting).
The USB charger that I received from Amazon yesterday (the one that I am reviewing right now) is "accepted" by my iPad all the time (the charging icon came out and never quitted), but I suspect actually it may or may not be charging my iPad. As I described, the battery level was actually dropping when I ran Pandora (the dropping rate makes me believe the iPad was not being charged even though the charging icon showed up). However, last night I left my iPad plugged in with this charger. It did charge to 100% (from 90%) this morning.
In conclusion, the output current of this charger does not meet the iPad requirements. At best, it can still slowly charge your iPad like your other USB chargers designed for other gadgets. But this charger may give you the false confidence that it is charging while it actually cannot even keep up with the discharging rate when your iPad is running an app like Pandora.
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