What is the letter identification method for start-stop batteries?
2 Answers
Start-stop battery identification method: The original vehicle battery is marked with terms such as ST, N55, Q85, S95, ISS, EFB, AGM, VRLA-BATTERY, start/stop, idle stop system vehicle, etc. If any of these terms are present, it is a start-stop battery. Start-stop car batteries are different from ordinary car batteries. Start-stop batteries have a larger capacity and can charge and discharge quickly. Ordinary lead-acid batteries cannot discharge large currents multiple times in a short period, as their separators do not allow rapid passage of electric ions. Start-stop batteries are manufactured using stamping processes, which require higher technical standards and are more expensive due to their advanced technology. Hazards of replacing a start-stop battery with an ordinary battery: 1. The start-stop system may not function properly. If the battery monitoring system (BMS) determines that the battery power is insufficient to restart the engine, it will not shut off the engine, thus failing to achieve the expected reduction in fuel consumption and emissions. 2. Under the start-stop system, an ordinary battery may lose 7%-16% of its effective capacity after one week of use. 3. Some fully sealed AGM batteries are installed under the seat or in the trunk. Replacing them with non-fully sealed ordinary batteries may pose safety hazards.
I remember when I first bought a car, I was also confused about the letter distinctions for batteries with start-stop functionality. Later, a mechanic taught me to pay more attention to the letter codes on the battery label. EFB batteries are usually marked with the letters 'EFB,' which stand for Enhanced Flooded Battery, suitable for regular start-stop systems. The letters are typically placed after the model number, such as the brand name followed by EFB. AGM batteries usually have an AGM label or, in some brands, codes starting with S or AGM, representing Absorbent Glass Mat technology, which is more durable for frequent start-stop cycles. Checking the label on the side or top of the battery can directly help you identify the type. When replacing the battery, it's essential to choose the correct type; otherwise, the start-stop system may trigger fault codes or even damage the car. I think developing a habit of regularly checking the battery's condition is a good practice to avoid getting stranded on the road.
