What battery is this and where to buy replacement battery?

You didn't mention what dash-cam model it is, but most of those type dash cams uses 3.7V battery.
I replaced in few dashcams with this battery:

http://www.aliexpress.com/snapshot/249115971.html

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Most dashcams of this type uses 3.7V 400-500mAh, so that should work for you.
 
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