When replacing the power cell in an electric watch, it is extremely important to pay attention to the battery well. The battery well often provides direct access to the gear train of the watch. There should be no debris (lint, dust, etc.) anywhere in the watch, including the battery well. The battery should be clean, with no corrosion, fingerprints, oil, or debris attached to it. The insulator (when required) should be clean and properly placed to prevent a short to ground. The battery clamp (when present) should be properly positioned to retain the battery in the event of a shock. All electrical contacts should be clean and in good condition. If there is any corrosion present or if the plating is coming off, they should be cleaned or replaced.