Check out the ChugPlug Portable Macbook Power Pack, an external battery for your MacBook that gives you up to four hours of additional charge. Better yet, it does so in concert with your MacBook's charger, with no additional cables needed. We have it for a whopping 76 percent discount, bringing the price down to $29.99.
Check It Out: ChugPlug Portable Macbook Power Pack: $29.99
