I can pay less than $50 per year for a battery test, with the first two absolutely free, and be assured that my warranty will not have been voided for not doing so. So I am out less than $300 for the 8 years that there is some sort of battery warranty should I decide to even keep the car that long.
Or, I can take the risk, and if I lose I will have to retain a lawyer to prove in court against the well-paid lawyers that Nissan has on retainer that the battery checks have nothing to do with my warranty claim. My time alone is going to be worth more than $300, not to mention any out of pocket costs I will have to bear until my claim is settled in my favor, if that even happens.
I don't know about some of you, but I know which option I am going to take.