leagend Debuts a Jump Starter Like Never Before on Kickstarter

leagend JS300 PRO series redefine vehicle starting with battery-free supercapacitor technology, intelligent monitoring, and two distinct user experiences.

LOS ANGELES, CA, UNITED STATES, October 20, 2026 /EINPresswire.com/ — leagend, top automotive electronics brand specializing in battery testers, battery monitors, chargers, diagnostic tools, and supercapacitor jump starters, is introducing a new approach to vehicle starting through its JS300 PRO and JS300 PRO-D, now featured in its successfully funded Kickstarter campaign. Combining battery-free supercapacitor technology with intelligent battery monitoring and a permanent-installation design, the two models aim to transform jump starting from an emergency response into a more proactive part of vehicle care.

Unlike conventional portable jump starters that rely on built-in chemical batteries and typically require users to store, charge, and retrieve the device when needed, the leagend JS300 PRO series is designed to remain installed in the vehicle and ready for use. By combining high-current starting assistance with intelligent system monitoring, the series brings together convenience, practical vehicle insights, and an alternative approach to emergency starting.
More importantly, leagend offers two distinct versions to meet different driver preferences: leagend JS300 PRO, designed around smart-app connectivity and intelligent control, and leagend JS300 PRO-D, which adds a dedicated onboard display for more immediate access to key system information.

Two Models, Two Experiences: Choosing Between JS300 PRO and JS300 PRO-D
Although leagend JS300 PRO and leagend JS300 PRO-D share the same core product concept, their key difference lies in how drivers access and interact with vehicle and jump-starter information.

leagend JS300 PRO: Intelligent Control Through a Smart App
Designed for drivers who prefer connected vehicle management, the JS300 PRO integrates with a smart app to provide access to key battery and jump-starter information. Users can monitor vehicle battery voltage and status, view jump-starter operating information, and access starting-related data through their connected device.

This app-based approach gives users a more comprehensive view of system performance while keeping the installation clean and integrated into the vehicle. For drivers who value connected technology, detailed information, and smartphone-based interaction, leagend JS300 PRO offers an intelligent and streamlined experience.

leagend JS300 PRO-D: Smart-App Connectivity Plus an Onboard Display
leagend JS300 PRO-D takes the experience further by adding a dedicated onboard display alongside smart-app connectivity. Drivers can access key information, including vehicle battery status and the supercapacitor jump starter’s state of charge (SoC), directly on the device without relying solely on a smartphone.

This additional display creates a more immediate and accessible way to check essential system information. It is particularly appealing to drivers who prefer at-a-glance visibility, want to see key data directly at the installation point, or value having both onboard information and app-based monitoring available.
The distinction is straightforward: leagend JS300 PRO emphasizes smart-app interaction, while leagend JS300 PRO-D combines smart-app connectivity with an onboard display for greater information accessibility. Both models retain the core battery-free supercapacitor technology and intelligent operating concept that define the series.

Beyond Traditional Jump Starters: A New Approach to Vehicle Starting
The innovation behind leagend JS300 PRO series goes beyond adding more features to a conventional jump starter. It reconsiders how a starting-assistance device can be integrated into everyday vehicle ownership.

Battery-free supercapacitor technology
Instead of relying on a built-in chemical battery, leagend JS300 PRO series uses supercapacitors to deliver high-current starting assistance. This battery-free architecture eliminates the need to maintain a separate internal chemical battery, offering an alternative to traditional portable jump starters.
Designed for permanent installation

The series is designed to remain installed in the vehicle, reducing the need to retrieve a device from storage, check its charge before use, or connect conventional portable jumper clamps each time starting assistance is required. Its integrated approach aims to make starting support more convenient and accessible.

Intelligent battery monitoring and control
leagend JS300 PRO series combines starting assistance with intelligent monitoring capabilities. Through the smart app, users can access relevant vehicle battery and device information, while supported operating features help the system respond to changing vehicle conditions. The result is a more integrated approach to starting assistance and battery awareness.

Engineered for challenging environments
Designed for demanding automotive applications, the series is intended to operate across a wide temperature range, from -40°C to 80°C. This emphasis on environmental resilience makes it relevant to drivers who face seasonal temperature extremes and want a permanently installed starting-assistance solution.

A more proactive approach to battery care
With features such as self-learning and Drive Mode, leagend JS300 PRO series is designed to support smarter interaction with the vehicle’s starting system. Rather than treating jump starting solely as an occasional emergency, leagend aims to bring starting assistance, system awareness, and everyday convenience into one integrated solution.

From Emergency Equipment to Integrated Vehicle Technology
For many drivers, a jump starter is an accessory that remains out of sight until a vehicle fails to start. leagend’s approach challenges this traditional concept by making the device a permanently installed component of the vehicle’s starting-support system.
leagend JS300 PRO and leagend JS300 PRO-D reflect this shift in two complementary ways. One offers a streamlined, app-centered experience; the other adds direct onboard visibility for drivers who want essential information available at a glance. Rather than forcing every user into a single interaction style, leagend provides two options built around the same underlying technology.
This product strategy also reflects a broader commitment to developing automotive electronics that combine practical functionality, intelligent monitoring, and user-oriented design. By integrating multiple capabilities into a single system, leagend seeks to deliver more value to drivers while creating new opportunities for innovation in the automotive aftermarket.

leagend: Advancing Intelligent Automotive Electronics Worldwide
With more than 20 years of experience in automotive electronics, leagend continues to develop solutions spanning battery testers, battery monitors, battery chargers, OBD II diagnostic tools, and supercapacitor jump starters. The company’s product development and R&D capabilities support its efforts to bring practical, technology-driven solutions to drivers and professional customers in international markets.
leagend JS300 PRO series represents an important expression of this direction: combining an alternative starting technology with intelligent monitoring and different user-interface options to address evolving expectations for automotive accessories.

The successful funding of leagend JS300 PRO Kickstarter campaign also demonstrates meaningful early support for the project. As leagend continues engaging with backers and the wider automotive community, the company aims to build stronger global brand recognition and expand conversations with distributors, retailers, automotive specialists, and potential business partners.
For prospective backers, the choice between leagend JS300 PRO and leagend JS300 PRO-D comes down to how they prefer to access information: connected smart-app interaction or the added convenience of an onboard display alongside app connectivity. Both models share the same central idea—making vehicle starting assistance more integrated, intelligent, and convenient.

Discover a new approach to jump starting with leagend JS300 PRO and leagend JS300 PRO-D on Kickstarter. Drivers, automotive enthusiasts, and technology-minded backers are invited to explore the two models, compare their features, and discover which experience best suits their needs.

Learn more and back leagend JS300 PRO and leagend JS300 PRO-D on Kickstarter here.

For business inquiries, distribution opportunities, and potential cooperation, please contact the leagend team at marketing@leagend.com.

About leagend
leagend is a top automotive electronics brand with more than 20 years of experience in developing and manufacturing battery testers, battery monitors, battery chargers, OBD II diagnostic tools, and supercapacitor jump starters. Through continued investment in product development, engineering, and R&D, leagend is committed to providing innovative automotive solutions and building long-term partnerships across global markets.

Arthur Kingsly
Shenzhen leagend Optoelectronics Co., Ltd.
+ +86 755-8282 1859
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