What battery comes stock? '08 Supra 21V

[cigars n scotch]

I want to get a second battery for my Supra. I will be installing new tower speakers and an amp and want to run dual batteries. Just wondering if anyone can tell me off the top of their head (my boat is not by me at the moment and I have off tomorrow)? I can easily just go to the boat tomorrow and look but it will save me some travel time since it is in the opposite direction of where I need to travel.

Any ideas? (it's got a green lid with a gray(?) body). I want to say it's an Interstate.

[docdrs]

my 09 had 2 interstate batteries in it, and still does

[Swamplandkarl]

The dealers install the batteries so depending where you purchased the boat will determine what brand would have been installed in your boat...

[The Squeaky Wheel]

My stock was an Interstate Cranking battery. I added a deep cycle for the stereo & amps.
boat '09 21V

[ditchsnake]

A lot of guys don't like them but I have had lots of luck with my two blue tops. They are not optimas but I believe they are Exide. Nice, no smell, leaks and have pleanty of reserve for me.