MiLi Power recently released the Power Shine, a 4000 mAh external battery that is sleek, portable, and highly compatible. The Shine is an easy to use external battery for iPad, iPhone, Android, Windows phone, or any other device using micro USB.
iPhone and iPad apps tagged "external battery."
Top Tips and Tricks for Extending the iPad Battery Life
There oughtta be a law against battery-sucking devices that don't have the energy to get through the day. The iPad is the newest darling of our erstwhile representatives in Washington, according to Politico.com, so maybe they will take on the task of mandating that tablets as awesome as the iPad come with extended battery life — or at least enough juice to get through two PowerPoint presentations, 10 chapters of a favorite book and 6-10 addicting hours of our favorite games.