A car starting battery is different from a normal storage battery. When starting a vehicle, the battery needs to release a very high current instantly.

This is why J-craft Motorsport uses:

Layered Oxide High-Rate Cells

Our sodium-ion battery is designed for automotive use, where strong instant output is required. Fully charged, it can reach 15.8V, helping to support better starting performance.

Solar energy storage batteries are usually low-rate batteries because they only need to provide stable power over time. They do not need to release high current instantly.

In simple terms:

✅ Car starting battery = high power output
✅ Solar storage battery = stable long-term output

They are two different types of battery usage.

For automotive applications, using the wrong type of battery cell may lead to weak starting performance and shorter lifespan. That is why choosing the right cell material is important.