Hybrid Battery Location

Ok, I've freakin searched everywhere for the answer to this question, but I haven't found it yet. Where in the world is the hybrid battery located on a 2002 Prius? I just want to check if it's leaking any power while my car is turned off. I know it shouldn't, but I think it might since I always seem to start my car with the SoC about half way down even though it ends at the very top.

I know they have an inverter in the front, but I don't think I'll get a very accurate answer by testing there.

Thanks for your help.