Don’t let the music stop with the Nyko’s iBoost for iPod.  An attachable rechargeable battery pack for all full size, dock connector iPods, the iBoost boosts its overall battery time up to 16 hours.

Its sleek design blends with the iPod, attaching to its back and wrapping up to the bottom. It’s actually light enough, stylish enough and small enough to never have to take it off.
The iBoost even features a dock connector pass through port, allowing song transfer, charging and docking of the iPod while the iBoost is attached.

List price: \$89.99, but generally available discounted at retailers like Target and Wal-Mart.