ChugPlug is the only seamlessly integrated external battery pack for MacBook computers. Designed in California, the ChugPlug charges and powers the 13in MacBook Pro and all models of the MacBook Air. The ChugPlug adds up to 4 hours of run time to the MacBook Air and up to 3 hours to a MacBook Pro. Extend your MacBook's battery life with the ChugPlug 65 Portable Power from Lenmar. The ChugPlug charges and powers 45W and 60W MacBook computers using your existing Apple AC Power Cable and MagSafe Power Adapter. Get up to 4 hours of additional run time without being tethered to an outlet.