What size 12 volt battery?

[bluedevil]

I am making a homemade underwater camera for ice fishing and I am not sure if I have large enough batteries? I have two 12 volt 7amp/hr batteries and one will be used for my fish finder. Will just one battery be enough to run a 12 volt 9" color TV and camera for at least a half day or better fishing? It will run the TV and camera but I dont know for how long it will run.
I was thinking of getting another battery of the same size and doubling them up or I came across a 12 volt 12amp/hr battery for $29.95 plus s/h. http://www.batterymart.com/p-12v-12a...d-battery.html (http://www.batterymart.com/p-12v-12ah-sealed-lead-acid-battery.html)

Your thoughts??

[Frogman]

Try this link to Cabela's. 12vdc 8ah battery, $20/1, $50/2 and a charger.http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0036388018049a&type=product&cmCat=SEARCH_all&returnPage=search-results1.jsp&Ntk=Products&QueryText=12v+rechargable+battery&sort=all&Go.y=17&_D%3AhasJS=+&N=0&Nty=1&hasJS=true&Go.x=16&_DARGS=%2Fcabelas%2Fen%2Fcommon%2Fsearch%2Fsearch-box.jsp.form23&_dyncharset=ISO-8859-1
A little bit better price and many good reviews. The battery that you found (good price for the size) is fine as long as the size isn't a problem.

Good luck.
Frogman