I've been wanting to buy/use a marine battery as a 1vdc
power source for emergencies such as ice storms etc

Thing is I don't know if there exists a "box" that will
contain he battery yet allow USB and 12vdc "ports" to
be obtained from it?

Bottom line...does there exist a "box" that will hold a
heavy battery such as this yet maybe have internal
connections for USB charging ports and still allow hook
up of 12vdc car "trouble" lights for home lighting?