the issue is what's available locally besides exide. I'd have to check on that
And you somehow managed to coddle it into the standard battery bay? Not that I have a problem with my mechanic making a secondary battery bay in the trunk for a high capacity battery. But I wonder what would running two high gauge wires into the trunk cost me. He did not charge an arm and leg when he was fornicating with the trunk installing the towing enabler but running the wires would require pulling the carpet and removing the seats I'd think.
Since I also live in the temparate climate I think I'd save the money and get a conventional battery of the same capacity as the one I have, dump it into the trunk and disconnect the negative terminal. Then once the main battery is dead I'll put the terminal back on. Jump start and disconnect it again.