Maybe the rest of you can list your requirements and get the correct battery fitted.
Here are mine.....
MUST be able to crank the engine 20x

Be able to run 4 6"x9", 1x12" sub, 1x4channel 120W/channel amp, 1x2channel 200W/channel amp.
DVD/CD player and 15"LCD screen... (To play StarWars on)

Electronic Ignition
Engine management system
Digital clocks.
So what would the specifications be?.... What Amps per hour, Voltage..... Battery type 621, 630, 728???? What make is the best, Willard, Sabat????