Apple is known for its great customer support, so if you're having some problems with your iPad that you just can't figure out on your own, you should try them out. Here are a few options you can explore for getting help:
Go to your local Apple Store if one is handy and see what the folks there know about your problem.
Visit the Apple support website. Here, you'll find online manuals, discussion forums, downloads, and the Apple Expert feature, which enables you to contact a live expert over the phone.
Visit the iPad User Guide. This PDF file is a more robust version of the User Guide that came with your iPad. You can open it using the bookmarked manual on the Safari browser.
Finally, if you need repair or service for your battery, visit the battery replacement service at http://www.apple.com/batteries/replacements.html.
Note that Apple recommends that the iPad battery should be replaced only by an Apple Authorized Service Provider.
If you can't find your answer from Apple-owned sources, you might be able to get results from a meeting place of fellow iPad users. You can search your question or go to a specific site specializing in Mac tips and news. Here are a few useful non-Apple discussion forums that may help provide some answers: