I've had no problems with the battery post connections but when I bought my CK30hst 4 years ago, I noticed some rust starting where the negative cable bolted to the frame. I unbolted the cable and cleaned the frame area and cable end. Connected it back together using copper antisieze grease then gave the area, bolt head, and inside the frame thread end another coat of antisieze. It's still good from 4 years ago.