• Damage to the battery post: Over-tightening the battery terminals can lead to excessive pressure on the battery posts, which are typically made of lead. Applying too much force can cause the posts to become deformed or cracked, compromising the battery’s connection and potentially causing it to fail.
• Stripped threads: The battery terminals and the posts have threads that allow for a secure connection. If you overtighten the terminals, it can strip the threads on either the terminal or the post, making it difficult to achieve a proper connection in the future.
• Battery case damage: Batteries have a plastic or metal casing that houses the cells and terminals. Excessive force on the terminals can cause the battery case to crack or break, exposing the internal components to potential damage and creating a safety hazard.
• Electrical system problems: Over-tightening the battery terminals can lead to electrical issues in your vehicle. It may cause poor contact between the terminal and the battery post, resulting in a weak or intermittent electrical connection. This can lead to a variety of problems, such as difficulty starting the engine, dim lights, or malfunctions in various electrical systems.
• Difficulty in future maintenance: Overtightened battery terminals can make it challenging to remove the battery or perform maintenance tasks. If the terminals are stuck or damaged, it can be time-consuming and frustrating to replace the battery or work on the electrical system.
• Safety concerns: Applying excessive force to battery terminals can increase the risk of accidents. If the battery terminals are damaged or become loose due to overtightening, they may generate sparks, leading to a potential fire hazard or electrical shock.

It’s important to tighten battery terminals securely, but it’s equally crucial to avoid overtightening. Follow the manufacturer’s recommendations for torque specifications or use a torque wrench if available to ensure the terminals are tightened appropriately.