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Amazon.com : ChugPlug Portable External Battery Pack for Macbook Air and Pro (45W and 60W) : Electronics
Lenmar Battery For NEC N840 Wireless Phone - Office Depot
Lenmar ChugPlug, External Battery Pack for MacBook Air and MacBook Pro 13”, Back Up Power Works with All 45Watt and 60Watt MagSafe Adapters: for an Additional 3-4 Hours of Run Time.