That sir would be incorrect.
Every car I've had in the last several years (whether it be street car, or race car) has had it's battery in the trunk. Relocating a conventional "wet" battery to the trunk requires a stupid looking and clunky battery box, and needs to be vented. In a racing application, every thing from a small crash, to a violent wheelstand usually results in that front mounted battery blowing it's load all over the engine and inner fender panel.....Even when that doesn't happen, the attractive green fungoo that forms all over the terminal posts and connections in a matter of a couple of weeks as a byproduct of a wet battery, is reason enough to NOT buy a crap, wet battery.
And that isn't even starting down the path of how a dry battery is a better tech solution for any hobby/street/racecar than a standard plate design wet battery.
The Optima has been in my trunk connected for over a year,..there is no crusty green/white junk on anything back there.