Currently Being ModeratedMay 3, 2012 7:21 PM (in response to jjodom1010)
The quickest way (and really the only way) to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
New iPad Takes Much Longer to Charge Than iPad 2
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
Extend iPad Battery Life (Look at pjl123 comment)
New iPad Slow to Recharge, Barely Charges During Use
Tips About Charging for New iPad 3
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
Currently Being ModeratedMay 3, 2012 7:41 PM (in response to Texas Mac Man)
Thanks but I already knew all of this. My problem is that my original iPad will not charge unless it is powered off. After testing further tonight I also discovered that after being powered off & charging for awhile I can power it back on & it will continue to charge. It only won't charge when the battery percentage is very low.
Currently Being ModeratedSep 7, 2012 11:50 AM (in response to jjodom1010)
I am actually having the same problem, it's very, very strange. I have talked to many technicians, who've told me it's a docking port problem, and want to charge me 100 dollars+ for repairs. However, I did find this report: http://www.ipadforums.net/ipad-1-forum/61499-ipad-1-not-charging-issue-resolved. html That it might be an amazingly simple fix. I'm currently trying to get ahold of the same tech this person did, to verify the report.
Good luck to you!