As regards your second comment, what you are doing is fine, but it really dosent matter much. Plug it in when you feel moved, and pull it out when you want rouse it. Other than a monthly full discharge to keep the meter calibrated, charge at your convenience.
As regards the first post.
You are doing good by shutting apps fully down, and keeping your screen brightness under control. All that is left are a few other things you can think about. And I think in your case it will be one or two things that you can control.
Are you syncing with the cloud? If it thinks it needs to sync, and can't get a good signal, it will keep trying and trying. There are also some cases of an 'irreconcilable address' where the cloud finds a conflict between two addresses, and just keeps going back and forth, running the wheels off the radio and the battery. If you are a cloud person, turn it off for a day or two and see if that is the problem.
Do you have any subscriptions, or feeds? Even if the app is off, or the pad is asleep, it maybe looking for an update, and keeps looking and looking.
Lastly, if your mail is on push, thrun that off. Particulalry in you are in a marginal signal area. The pad will run itself to death checking your email and looking for a signal. Fetch, every hour or so will keep you informed, and take some heat of the battery.
So play around with your settings. Noticiations, updates, location services all use juice. Turn off as much as you can, then, gradually turn them back on until you find the culprit.
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