My Group 34/78 battery sits in a sealed battery box that's mounted sideways in the trunk, tucked behind the right rear wheel. The box has a tube that vents outside the trunk.
https://www.summitracing.com/parts/sum-g1230
I run external 'jump start' terminals under the hood. Photo below shows the terminals, but they're mounted without the bracket, directly on the chromed trim panels inside the engine compartment.
I can put a charger or battery maintainer on the terminals or check the voltage without having to open the trunk or battery box.
https://www.americanautowire.com/sho...art-block-prov