Leagend to launch JS300 PRO supercapacitor jump starters on Kickstarter Oct. 9

Leagend will launch the JS300 PRO and JS300 PRO-D on Kickstarter Oct. 9, betting that a permanently installed, battery-free supercapacitor system can replace the traditional portable jump starter. The campaign adds battery monitoring, app connectivity and, on the PRO-D, a solar-assisted onboard display.

Why it matters: - Leagend is trying to turn jump-starting from an emergency accessory into a permanent vehicle system. - The JS300 PRO line combines starting assistance with battery testing, monitoring and protection in one installed product. - The pitch targets drivers who deal with weak batteries, harsh weather, short trips or long parking periods.

What happened: - Leagend will launch the JS300 PRO and JS300 PRO-D on Kickstarter on Oct. 9, 2026. - The campaign runs through Nov. 22, 2026. - The launch theme is “One System. Two Ways to Start.” - The products are designed around battery-free supercapacitor technology and permanent vehicle installation.

The details: - The JS300 PRO series is built to stay connected to the vehicle instead of being stored in the trunk for emergencies. - The system is designed to provide starting assistance under different battery conditions. - The operating temperature range is -40°C to 80°C. - The supercapacitor architecture is intended to absorb and release energy quickly for high-current starting needs. - The battery-free design removes the need to recharge a built-in chemical battery just to keep the unit ready. - The smart app provides battery and starting-system data, including state of charge, state of health, cold cranking amps, battery voltage, starter voltage, battery and starter temperature, starting performance, and starting history and trends. - The product concept combines a jump starter, battery tester, battery monitor, battery protector and always-ready start system. - Self-Learning Mode lets the system adapt to vehicle starting and battery behavior. - Drive Mode is designed for the permanently installed setup and works with the vehicle's starting battery and charging system when the engine is running. - When the engine is off, the system returns to standby. - The JS300 PRO-D adds a solar-assisted onboard display. - The onboard display shows key information, including state of charge, without opening the mobile app. - The app remains the deeper monitoring interface for both models.

Between the lines: - Leagend is positioning the product as preventive maintenance hardware, not just roadside rescue gear. - The company is leaning on connectivity and continuous data to justify a more permanent installation. - The solar-assisted display on the PRO-D gives the product a second user interface for quick checks inside the vehicle. - The broader strategy appears aimed at owners who want fewer surprises from aging batteries and more visibility before failure. - A leagend representative said the goal is to transform emergency response into proactive vehicle protection.

What's next: - Leagend will use Kickstarter to introduce the JS300 PRO and JS300 PRO-D to drivers, automotive enthusiasts and tech-focused backers. - The campaign will highlight the PRO model's smart app connectivity, self-learning functions and battery-health monitoring. - The PRO-D will focus on the onboard display plus the same starting and monitoring features. - More information is available through leagend's supercapacitor jump starter page.

The bottom line: - Leagend is betting there is demand for a jump starter that acts like an always-on battery management tool, not a device you only think about after a breakdown.