Crazy. The idle of my S2000 was really bad, i was thinking that i have to clean the Idle controll valve when the car is in Winter storage. And the starter was grinding two times.
After i put my S2000 in Winter storage, two different battery chargers showed that the battery cant get charged anymore, she was dead. Battery was 5 Years old. Little bit to young to die.
I just have orderd a new one, this time a Yuasa.