Gomadic Portable AA Battery Pack for the Microsoft Zune HD - Powered by 4 X AA Batteries to provide

• Integrated circuitry regulates output voltage specific to the Microsoft Zune HD. Advanced logic maximizes overall charger efficiency.
• Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (Microsoft Zune HD specific), TipExchange enabled (Yes)
• Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors.
• The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty.
• Internal circuit designed to protect your Microsoft Zune HD from power surges, overcharging and short circuiting.

Ok I was worried that this would blow up my Zune, but it works as intended even though the unit I got had a different form factor than the picture.

I've had it at least a few weeks, charged up my Zune a few times, including twice from basically zero, and it still hasn't needed to change the batteries I put in it.

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