What Causes the Positive Terminal of a Car Battery to Overheat?

1 Answers
LaLevi
07/30/25 12:00am
Loose battery terminal connections can cause overheating. Below is a detailed explanation of why the positive terminal of a car battery overheats: 1. Introduction: A car battery, also known as a storage battery, is a type of battery that works by converting chemical energy into electrical energy. Typically, car batteries refer to lead-acid batteries, which are mainly made of lead and its oxides, with sulfuric acid solution as the electrolyte. 2. Loose battery terminal connections: This can cause overheating—simply reconnect them properly. 3. Remove the terminal clamps: Clean the contact surfaces on both sides and apply grease. 4. Tighten the battery terminals: These steps can usually fix the issue. If the battery itself is damaged, it should be replaced. 5. High engine idle speed: First, clean the throttle body and idle control valve. Excessive carbon buildup or a stuck idle control valve can cause high idle speed or engine vibration.
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