How do I convert a wall socket (2 prong) electronic to Battery source power?

So I have a bit of a conundrum. I work at a small business that rents a space- the landlord is having us eliminate all drop cords from the store. We have two "open" signs that cannot be relocated to correlate to a wall socket- so I thought we might try converting the led signs to battery power. The plug for the signs is two-pronged. I have no experienced with wiring electronics or anything remotely related. I've noticed that there are many posts as to the conversion from a  battery to an ac adapter but nothing remotely close to what I need to do/ attempt. Can anyone help me by giving me detailed instructions on how to do this, a list of items, and where I might acquire these items? I would greatly appreciate the help. If any more details are needed please let me know- our business has been lacking from the absence of the signs. 

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You can buy 12 volt LED open signs quite cheaply, you could run it off a 12 volt SLA battery, You will need to charger too.

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And to make my wrong comment appear at least a little bit better:
Post some images of the inside of your sign.
If possible so that the electronics are in high resolution and sharp.
Also let us know what kind of power adapter is used, if any or if the sign only has a mains connection.
With that info it will be quite easy to tell you if and how to make it run on batteries.

Downunder35m8 months ago

1. These signs must be connected to mains power at all times.
2. Their batteries are just a backup if the power fails so people find their way out in an emergency.
3. Messing with them will get you and your landlord into trouble.

Downunder I think your referring to EXIT signs for fire escape.

LOL You're right - Stuffed that one up... :(