What Pocket-Sized External Battery Works with a Handheld DVR?

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A user is seeking a pocket-sized external battery compatible with a handheld DVR, as the manufacturer's battery pack is only available in Korea. The DVR's manual specifies that the original battery pack operates on three alkaline UM-2 (C) batteries and connects via an AC/DC adaptor outlet with specifications of DC5V 2A. The device also has an internal lithium-ion battery rated at 3.7V and 2000mAh. Suggestions for alternatives include a 4-cell battery holder for C batteries available from a specific retailer and a similar option from Radio Shack for D batteries. The discussion emphasizes the need for a battery pack that meets the specified voltage and current requirements.
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I am looking for a pocket-sized external battery to work with a handheld DVR. The manufacturer does make an external battery pack, however the manufacturer of the device is located in Korea, and no US dealers sell it.

From the product manual, it states that the manufacturer's external battery pack runs on... 3pcs of Alkaline UM-2(R14/1.5V) (Regular "C" batteries I think.)

The manufacturer's battery pack hooks into the unit's AC/DC adaptor outlet. The specs are DC5V 2A.

The unit has an included internal battery, which a is 3.7[V], 2000[mAH] lithium ion battery.



Can you think of any pocket sized solutions to my problem here? What do I need to look for in a battery pack that would work? Thanks very much.
 
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This company sells a 4-cell battery holder for "C" batteries:

http://www.hobbyengineering.com/H1708.html

Radio Shack has a 4-cell "D" battery holder. For others, search the web.

Bob S
 
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