Using electrical outlets off of battery

Yup, here is a couple ac outlets that will run off your RV batteries.
It will run the tv, sat receiver, DVD, vacuum cleaner, and even a sound system. And it is quiet, no fan,....worked so good I just bought a 2nd one.
Just plug it in the cig liter socket, or chop the plug off and wire to battery.
http://www.ebay.com/itm/191694191726?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

upsfella wrote:
If I have my batteries charged can I use the outlets in camper? What would I have to do? Thanks in advance for any answers on this.