Just found this

[TDM]

Thought someone might be interested in this

Walmart.com: Datexx Nickel Metal Hydride Handheld Battery : Cell Phones

 

[Walrus]

Don't see on there what the power output is. If it's less than 1A it won't power a usb-passthrough.

 

[sMuCk_fOg]

Item DescriptionTop of Page

The Datexx Nickel Metal Hydride Handheld Battery eliminates the need to carry multiple chargers on the road. You can plug any USB-powered device directly into its USB jack for charging — it supports cell phones, iPods, audio players and more. It's great for portable PDA's such as your Blackberry, and also works with portable game units such as Sony PSP and Nintendo DS. It even works with the iPhone.

Battery Information

Battery Size AA
Battery Chemistry Nickel-Metal Hydride (NiMH)
Capacity 2200 mAh
Output Voltage 5 V DC
​

Physical Characteristics

Dimensions 0.75" Height x 2.38" Width x 3.88" Depth
Weight 6.2 oz
​

Miscellaneous

Package Contents
Nickel Metal Hydride Handheld Battery
5 x Power Tip: DA01, DA03, DA06, DA10 DA32

Compatibility
Cell Phone
iPod
iPhone
PDA
Sony PSP (5 hours)
Ninendo Gameboy
Bluetooth
GPS
Standard USB Products

​