Battery Carrier and Hold-Down Clamp
The battery carrier should be in good condition so that it will support the battery securely and keep it level. Before installing the battery, check that the battery carrier and hold-down clamp are clean and free from corrosion and that there are no foreign matter in the carrier.
To prevent battery from shaking in its carrier, the hold-down clamp bolts should be tight enough but not over-tightened.