Extended battery pack for iPads & MacBooks - $169

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+ The Mac Observer Editors' Choice Awards 2010 Winner +
+ Macworld Awards 2010 Best Hardware Nominee +

Professional High Capacity External Battery for Apple iPad/iPhone/iPod/USB
- Power your USB devices for long extended periods away from the grid!

Features
- Use your MacBook for up to 20 hours1
- Compatible with all models of Apple MacBook / MacBook Pro / MacBook Air
- Additional high power 10W (5V/2.1A max) USB port charges any USB device (e.g. iPad/iPhone/iPod) simultaneously
- High capacity 60-Watt-hour lithium ion battery (compared to MacBook Air 37Wh battery)
- Extend iPad battery life by up to additional 24 hours
- Fully recharge the iPhone up to 14 times
- Military grade lithium ion cells, rechargeable up to 1,000 times
- Built-in short circuit, overcharging and temperature protection
- Beautiful aluminum housing, color matched to complement the MacBook
- Laser engraved logo and all-white accessories
- 1 year limited warranty

What's in the box

HyperMac External Battery
12-15V DC auto/airline adapter (for connecting HyperMac to the Apple MagSafe Airline Adapter)
AC power supply 100-240V (for charging HyperMac)
Printed documentation
Based on using MacBook/MacBook Pro 13" with 63.5-watt-hour (10 hours) rated internal battery, rounded to the nearest hour. Requires MagSafe Airline Adapter (sold separately by Apple).

HyperMac External 60Wh Battery for Apple MacBook, iPad, iPhone, iPod, USB

 

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Mophie Juice Pack Power Station - $99

This appears to be a better choice for those who don't need to also connect to their MacBooks:

The Mophie Juice Pack Power Station offers an extended battery for iPads, iPhones, and iPod touches.

*******This 3600mAh external battery will charge a wide range of usb based mobile devices including the iPhone and iPad as well as*most usb based smartphones out there. With completely reengineered battery and electronics, the powerstation can charge your device. $99

mophie juice packâ„¢ powerstation - travel battery charger for iPod, iPhone, iPad and other smart phones