FTO AUSTRALIA

Hey guys, i'm planning to put my car in the autosalon this year & last time I had battery issues. I bought a battery car charger, so i can charge my battery & play my ps2, music & watch movies without turning on the car since your not allowed to turn on your engine, but after a couple of hours, my battery died. Lucky i managed to start the car again & let the engine run for about 5-10 minutes to charge. So do you guys think i need a better battery or need a bigger charger?
Thanks
Ben (DRFTO)

no matter what battery you use it will run dead in a few hours some may last longer but no battery will last running all that with out the engine on
option 1 duel batterys will last longer
option 2 bigger battery will last slightly longer
option 3 buy a jump start so when it dose go dead