overnight charge of Ipad

No, here are some tips

http://www.apple.com/batteries/ipad.html

I would certainly suggest that you read the link that has been posted for you above mine.

But the short and sweet answer is no - if my experience is any indication of battery longevity. My pad is 10 months old - I have charged it overnight almost every night since day one - and I get the same 10 hours or so of daily use out of the charge that I got from day one.

Normally charging IPAD overnight or not to 100%, the battery loose around 7% of its capacity a year.

When the battery loose ~20% of its original capacity in about 3 years there is a sharp degradation and the battery is not able to hold the charge. It may last more or less depending on the use.

But if you charge to less than 100% there is a great increase the battery longevity.

For example, if you charge up to 80% the battery longevity may reach 10 years. It is good as the battery replacement in IPAD is not that easy and have a cost.

Below data about battery longevity (cycles) discharging fully and charging to different levels.

1. 4.3V - 110% charge, battery life 150~250 cycles.
2. 4.2V - 100% charge, battery life 300~500 cycles
3. 4.1V - 90% charge, battery life 600~ 900 cycles.
4. 4.0V - 70% charge, battery life 1200~ 2000 cycles.
5. 3.92V - 50% charge, battery life 2000~4000 cycles.

Good practice is also not let the battery fully discharge as it will also reduce the battery longevity, you may start charging at 30~40%.

For example, Samsung have this feature of charging up to 80% in their notebooks to improve the battery longevity.

Below copy of their website (By the way, I don't have any Samsung products)

"Keep Your Battery Going with PowerPlus

PowerPlus is a technology offered on Samsung notebooks designed to let you discharge and recharge your laptop battery up to 1,000 times. That’s better than three times the longevity of a standard laptop battery, which typically wears out after 300 cycles and three years of daily use.

Most battery damage occurs when the cells inside are at or near capacity. That’s because batteries get a bit hot under the collar when they max out their charge at 100 percent. This heat causes the delicate structures within to start to break down, which ultimately makes the battery less capable of holding a charge. Eventually capacity drops to the point where the battery won’t hold a charge at all and it has to be replaced.

PowerPlus works to avoid this problem by keeping your battery properly conditioned, thanks to a set of technologies that helps prevent this kind of damage to the delicate electronics inside.

Battery Life Extender

One of the key features of PowerPlus is a simple setting you’ll find on your Samsung laptop called Battery Life Extender. You’ll find Battery Life Extender under the Samsung folder, inside “All Programs” in your Start menu. Here you’ll find the option to either leave your battery in Normal mode (which lets the battery charge to 100 percent of its capacity) or engage the Battery Life Extender mode, which caps the charge at 80 percent.

Battery Life Extender helps keep the battery from overcharging and overheating, which protects it from being damaged. The result is a battery that keeps on going for years. And of course, it’s an option you can turn off or on at any time. If you find you need a little extra juice for a long flight, the setting can always be returned to Normal mode, giving you full access to 100 percent of the battery’s capacity

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

http://www.macblend.com/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

http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/

Apple Explains New iPad's Continued Charging Beyond 100% Battery Level

http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- beyond-100-battery-level/

New iPad Takes Much Longer to Charge Than iPad 2

http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html

Apple Batteries - iPad http://www.apple.com/batteries/ipad.html

Extend iPad Battery Life (Look at pjl123 comment)

https://discussions.apple.com/thread/3921324?tstart=30

New iPad Slow to Recharge, Barely Charges During Use

http://www.pcworld.com/article/252326/new_ipad_slow_to_recharge_barely_charges_d uring_use.html

Tips About Charging for New iPad 3

http://goodscool-electronics.blogspot.com/2012/04/tips-about-charging-for-new-ip ad-3.html

Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips

http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad

iPhone, iPod, Using the iPad Charger

http://support.apple.com/kb/HT4327

Install and use Battery Doctor HD

http://itunes.apple.com/tw/app/battery-doctor-hd/id459702901?mt=8

In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.

 Cheers, Tom 😉