Stereo & Electronics - What size braille or oddesy battery for trunk mount 10:1cr and no heat/ac?

Forced to put a battery in my trunk finally as i have no room for my 11 lb oddysey battery. What size are those with experience running? what info do you need to determine it? trying not to add a bunch of weight back in with anything like a red or yellow top monster!

any help is appreciated! :chug:

does Anybody have a light weight battery in the trunk? trying to figure out if it's strong enough. thanks