ChugPlug External Battery Pack for MacBook Air 11%22 and 13%22 and MacBook Pro 13%22 Portable Charger (Works with 60 and 45 Watt MagSafe Adapters)Magic Mobile Partners via Amazon offers the ChugPlug External Battery Pack for MacBook Air and MacBook Pro for $39.99 shipped. That's $90 off the original list price, $69 less than Best Buy and the lowest we can find. 

Features:

  • 11" MacBook Air: up to 4 Additional Hours
  • 13" MacBook Air: up to 3 Additional Hours
  • 13" MacBook Pro: up to 3 Additional Hours
  • It does not work with 15" MacBooks
  • Seamlessly Integrated Design: Utilizes your original Apple AC Power Cord & MagSafe Power Adapter
  • Works with 45 Watt and 60 Watt MacBook

It received 3.3/5 stars from Amazon shoppers and comes with a 1 year warranty from Lenmar.

ChugPlug External Battery Pack for MacBook Air 11%22 and 13%22 and MacBook Pro 13%22 Portable Charger