leagend launches JS300 PRO SuperCap jump starter on Kickstarter

leagend is launching its JS300 PRO and JS300 PRO-D battery-free jump starter systems on Kickstarter on Oct. 9, 2026. The permanently installed devices add battery monitoring, extreme-weather support and smart app features aimed at preventing starting failures before they happen.

Why it matters: - leagend is positioning the JS300 PRO series as more than a backup jump starter, with permanent installation and live battery monitoring designed to help drivers catch problems before a no-start event. - The launch targets everyday pain points tied to battery aging, extreme temperatures, long parking periods and frequent short trips. - The Kickstarter campaign could broaden access to vehicle power-management tools that combine starting assistance with battery diagnostics.

What happened: - leagend announced the JS300 PRO and JS300 PRO-D, two battery-free SuperCap jump starter systems. - The Kickstarter campaign, titled “One System. Two Ways to Start.”, starts Oct. 9, 2026. - The company says the systems are designed as permanently installed vehicle units that connect to the starting battery.

The details: - The JS300 PRO series uses battery-free SuperCap technology instead of an internal lithium battery. - The system is built to operate across a temperature range of −40°C to 80°C. - The architecture stores energy through electrostatic charge and releases it quickly for high-current starting assistance. - leagend says the design supports vehicles in harsh climates, long storage periods, frequent short-trip use and aging battery conditions. - Through the leagend smart app, drivers can view State of Charge, State of Health, Cold Cranking Amps, battery voltage, starting performance, temperature data and historical starting records. - The system is designed to continuously monitor battery conditions and flag issues before they become failures. - Self-Learning Mode analyzes vehicle starting behavior and battery conditions to adjust operating logic. - Drive Mode lets the system stay integrated with the vehicle while the car is running, then return to standby after shutdown. - The JS300 PRO-D adds a solar-assisted onboard display for viewing key information, including State of Charge, without opening the app. - leagend says the display and app create two ways to check the system: quick in-car access and deeper mobile analysis. - The Kickstarter lineup includes the JS300 PRO with smart app connectivity and the JS300 PRO-D with the onboard display.

Between the lines: - The launch reflects a shift from reactive emergency jump packs toward ongoing battery management. - The permanent-install approach may appeal to drivers who want a more integrated solution than a portable starter kept in the trunk. - leagend is leaning on prevention and visibility as the main selling points, not just raw starting power.

What's next: - The Kickstarter campaign opens Oct. 9, 2026. - leagend says more information will be available through the official campaign page when it launches. - The company will market the JS300 PRO as the base system and the JS300 PRO-D as the version with the solar-assisted display. - leagend can be reached for media and business inquiries at marketing@leagend.com. - The company lists its social channels here: LinkedIn, Instagram, Facebook and X.

The bottom line: - leagend is trying to turn jump-starting into a smarter, always-on battery health system rather than a one-time emergency fix.