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Where can I find a USB chargeable battery pack to wire to a light and switch?

I'm converting an old steamer to a cosplay prop. The prop has a lightbulb and on-off switch that I'd like to wire up. The entire thing is enclosed, so I'd like to use a high quality chargeable battery pack that I can plug a micro USB into, and use the USB end to plug into a computer or wall (with a converter) to charge it. I can take apart the pack and wire it up to the switch and light accordingly. My only question is, where can I find a reverse battery charge pack? All the ones I'm finding in google searches are to charge other devices (cell phones, etc) as well as itself...

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