How to charge iPad (v1) on a Windows device I have an iPad (first revision) and want to charge it using my Windows laptop. It doesn't want to charge and I've read quite a lot about it now (this one here amongst others via Google), but I haven't found a complete working answer.

Edit: I'm not so much interested in the why. But more in a practical solution, preferably without any hardware costs. Can someone give a HowTo on charging an iPad on Windows devices?
An insufficiently-powered USB port will charge an iPad, just slower than a high-powered one. 

When you plug the USB cable into your laptop the iPad will say "Not Charging." However, when the screen is off it is in fact charging. As soon as you turn the screen on again the battery area will say "Not Charging," too, but again, with the screen off it will charge.

Test it yourself: before plugging in the cable check the battery percentage. Then plug it in and leave the iPad off for 30 minutes; when you turn the screen back on you'll see that the percentage has increased.

In my case it takes several hours to charge from 50% to 100%, but at least it's charging.