A semi-traction battery can be recognized by certain features and specifications. Here are some ways to identify a semi-traction battery:

1. Construction: Semi-traction batteries generally have a robust construction suitable for applications that require repeated deep discharge and recharge. They may have a sturdy casing and are designed to withstand vibrations and shocks.

2. Capacity: Semi-traction batteries generally have a higher capacity than standard car batteries. They often have a higher Ah (Ampere-hour) rating, indicating that they can hold a larger charge and provide power over an extended period.

3. Plate structure: Semi-traction batteries can have a different plate structure than standard car batteries. They may have thicker and heavier plates, which are better able to withstand deep discharge and recharging.

4. Discharge: Semi-traction batteries are designed to be repeatedly deep-discharged, unlike starter batteries that are primarily designed for short bursts of high current output during vehicle startup.

5. Applications: Semi-traction batteries are often used in applications requiring a long-lasting power source, such as marine applications, recreational vehicles, RVs, caravans, golf carts, and solar energy systems. If you encounter a battery specifically recommended for such applications, it is likely a semi-traction battery.

However, it is important to note that the term "semi-traction" is not always used uniformly and may vary depending on the manufacturer and region. It is advisable to consult the manufacturer’s specifications and recommendations to ensure you get the right battery for your specific application.