Deep Cycle batteries are not designed to deliver instantaneous "cranking amps" like a typical car battery. Thats why a "deep cycle" battery will be larger than a regular battery with the same cranking amps. Cranking amps are not the same as operating amps. "Deep cycle" batteries are designed to survive being discharged by about 80% over and over again and continue to deliver a steady source of power. Regular batteries have a 50% duty cycle.
The typical car battery is about 100 amps.
The average LCD TV consumes about 110 watts while the average LED consumes about 100 watts.
A fully charged battey is about 13 volts DC
110 watts divided by 13 volts = 8.5 amp hours
100 amps divided by 8.5 amp hours = 11.76 hours
50% of 11.76 hours = 5.88 hours of TV watching
Deep Cycle battery
80% of 11.76 hours = 9.41 hours of TV watching
If this is something you want to do than my advice is to buy a deep cycle battery and small battery charger to charge the battery the day before the game.. like this one...
http://www.amazon.com/Schumacher-SE-520 ... B0009IBJCG
You need a way to connect the battery to the inverter so buy one of these...
http://www.amazon.com/dp/B00065L2D8?tag ... 31NKCK85J&
Speaking of inverters. You don't want to run one at it's max capacity so I'd suggest one that can support at least twice the load. You may also want to plug something else in so buy one of these...
http://www.amazon.com/Tripp-Lite-PV375- ... to_title_0