Both the Wi-Fi and Wi-Fi + 3G models of Apple's iPad 2 use the company's proprietary 30-pin dock connector port for charging. 30-PIN to USB charging cables are available from Apple both online on Apple.com and in Apple retail stores in a number of countries across the globe, as of December 2015.
Apple's USB 2.0 cable works with iPod, iPhone and iPad devices and can be used either on its own or with a docking product to sync and charge an iOS device with a computer. Customers can also purchase a USB power adapter from Apple, allowing them to use their USB cord to charge their device directly from a power outlet without a computer. Numerous more inexpensive third-party alternatives are available from retailers such as Amazon.com.
After using the 30-pin design for close to 10 years after its 2003 release, Apple introduced a new charging port called Lightning in 2012, along with the iPhone 5 and a series of new iPods. Fourth generation and beyond iPads also make use of the Lightning connector. The port is 80 percent smaller, sturdier and can be inserted face-up or down. Apple offers an adapter that allows customers to use certain 30-pin accessories, such as charging cables, with newer products, but not vice versa.