Charging a semi-traction battery requires specific steps and considerations. Here is a general guideline for charging a semi-traction battery:

1. Safety: Ensure you take the necessary safety precautions during charging, such as working in a well-ventilated area and avoiding open flames or sparks near the battery.

2. Check the battery: Inspect the overall condition of the battery before starting to charge. Check for any damage, corrosion, or leakage. If the battery is damaged, it may need to be replaced before you start charging.

3. Select a suitable charger: Use a battery charger that is suitable for the type of semi-traction battery you have. Ensure the charger can deliver the correct charge current and has the right charge profile for a safe and efficient charge.

4. Connect the charger: Properly connect the battery charger to the battery. Ensure the positive (+) and negative (-) terminals of the battery are correctly connected to the corresponding connections of the charger. Follow the manufacturer's instructions for the charger.

5. Set charging parameters: Some battery chargers have adjustable charging parameters, such as charge current and charge voltage. Check the specifications of your semi-traction battery and set the charger's parameters accordingly. Follow the recommendations of the battery manufacturer.

6. Start charging: Begin charging by turning on the battery charger. Monitor the progress during charging and follow the recommended charging time according to the battery's capacity.

7. Complete charging: Once the battery is fully charged, turn off the battery charger before disconnecting the connections. This prevents potential sparks or damage.

It is important to follow the instructions and recommendations of both the battery manufacturer and the charger manufacturer. Each type of semi-traction battery may have specific charging needs depending on its construction and materials used.