iPad Not Charging? Maybe it is.

When you connect your iPad to your Mac, you may have noticed that it displays "Not Charging" next to the battery icon.

The iPad is not able to charge from the low-powered USB ports found on some older Macs (and PCs) and some USB hubs. However, in many cases, the iPad will actually charge, but only when the iPad screen is off.

So, if you’re getting the “Not Charging” message, try leaving your iPad plugged-in and see if the battery has recharged a little after an hour or so.

iPhone 4 Tip: Display Battery Percentage

The battery icon on an iPhone gives you a rough idea of how charged the iPhone battery is. For a more exact indication, you can choose to show the actual percentage of battery charge, as well.

On your iPhone, open Settings and then tap General. Next, tap Usage. You'll see the Battery Percentage setting at the top of the screen. Tap the switch to turn it on.

Now, the percentage of battery charge is displayed next to the battery icon in the upper-right corner of the iPhone screen.