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

1. Construction: Semi-traction batteries usually have a robust construction suitable for applications where repeated deep discharge and charging are required. 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) value, indicating that they can hold a larger charge and provide power over a longer period.

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

4. Discharge: Semi-traction batteries are designed for repeated deep discharges, unlike starting batteries which are primarily designed for short-term high power delivery when starting a vehicle.

5. Applications: Semi-traction batteries are often used in applications where a long-lasting power source is needed, such as marine applications, recreational vehicles, campers, caravans, golf carts, and solar energy systems. If you come across 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 can vary depending on the manufacturer and the region. It is advisable to consult the manufacturer's specifications and recommendations to ensure you get the right battery for your specific application.