After connecting your iPad to a PC via its own USB cable, you found that your iPad couldn't be charged. What happened? As we know, the voltage of iPad's battery charger is 5V and the electric current is 10A, but general computer's USB port is given 5V voltage and 500MA (0.5A) electric current. For iPad, the 0.5A electric current is clearly not enough to charge it.
One thing need to be explained is that the 10A is the maximum output value of iPad's electric current, that is to say, while using the iPad device, the electricity's value can't go far beyond this range. According to the instructions on the iPad's battery charger, iPad only need 0.45A electricity to be charged, even so, it is perhaps not enough to use the 0.45A-electricity USB port to charge the iPad, because the charging equipment will consume parts of quantity of electricity themselves.
When reading here, some iPad owners would be in despair. How could Apple be so inconsiderate! In fact it is not like that. The USB ports which are included on the iMac and Macbook (Pro) launched after the year of 2007 provide enough power to charge the iPad. In addition, many PC manufactures especially the motherboard manufactures have already been aware this problem, and rushed out their motherboard patches in succession so that their USB ports can charge the iPad.
For instance, if your computer is equipped with the AUSU motherboard, you will go to the official website of ASUS to download a USB patch program named AiCharger. This patch program actually does not aim at the only ASUS motherboard. It supports the majority of motherboards well. In fact, the AiCharger program modifies the default value of the USB port's electric current through adjusting some settings in the registry.
Currently, the AiCharger USB patch program is compatible with Windows XP, Windows Vista and Windows 7, but I am not sure if it can be installed on the Windows 8. After installation, the system needs a reboot, then there will be an icon of the AUSU AiCharger which is similar to a charger on the taskbar. Now you can connect your iPad again, then the USB port will start charging your iPad.
By the way, due to the AiCharger patch software achieve the goal through modifying the Windows Registry, there might be some potential risk existing to your computer, so you'd better charge your iPad using its own charger. In addition, the Aicharger has no shutoff function, so you will need to delete it to shut it off.
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