The leagend JS200H Supercapacitor Starting Assistant is designed for those electric vehicles (EVs), range-extended electric vehicles (REEVs), and hybrid vehicles which are equipped with a 12V lead-acid auxiliary battery and no 12V starter motor. It helps address situations where insufficient auxiliary battery power prevents the vehicle from entering its normal ready-to-drive state, even when the high-voltage traction battery still has energy.
Unlike a conventional portable jump starter, JS200H is designed for permanent installation near the vehicle's 12V auxiliary battery. Its supercapacitor technology stores energy for short-term assistance when needed, while also helping buffer voltage fluctuations in the vehicle's low-voltage electrical system during operation.
Once properly installed and initially charged, JS200H manages its operation automatically according to vehicle conditions. It can replenish its stored energy from the vehicle's 12V power supply, so you don't need to carry a portable jump starter or open the app every time you drive. When additional assistance is required, you can activate the forced-start function through the Super Starter app or the device's built-in button.
Designed for a wide operating temperature range of −40°C to 80°C (−40°F to 176°F), JS200H combines supercapacitor energy storage, automatic operation, and Bluetooth app monitoring in a compact, permanently installed system.
Whether you're looking for everyday low-voltage support or an additional way to address auxiliary battery power shortages, leagend JS200H offers a convenient solution for compatible vehicles.
Please check vehicle compatibility before ordering. JS200H is not suitable for every EV or hybrid. Your vehicle must use a 12V lead-acid auxiliary battery and have no 12V starter motor.
Supercapacitor Technology
JS200H uses five series-connected supercapacitors, each rated at 3.0V / 360F, to store and release energy for short-duration vehicle assistance. Unlike conventional portable jump starters that use built-in chemical batteries, JS200H is designed to remain installed in the vehicle and provide assistance when required.
Automatic Low-Voltage Starting Assistance
After installation and a full initial charge, JS200H automatically manages its operation according to vehicle conditions and available stored energy. When the 12V auxiliary battery cannot provide sufficient power for normal vehicle activation, JS200H can offer short-term assistance if the device is adequately charged and vehicle conditions permit.
It provides an additional source of assistance without requiring manual activation during every normal drive.
Automatic Low-Voltage Starting Assistance
After installation and a full initial charge, JS200H automatically manages its operation according to vehicle conditions and available stored energy. When the 12V auxiliary battery cannot provide sufficient power for normal vehicle activation, JS200H can offer short-term assistance if the device is adequately charged and vehicle conditions permit. It provides an additional source of assistance without requiring manual activation during every normal drive.
Voltage Buffering During Vehicle Operation
When the vehicle is running and the device's output relay is connected, the supercapacitors can participate in short-term energy absorption and release, helping buffer some voltage fluctuations in the 12V electrical system.
This function complements the vehicle's existing low-voltage power management system. Its actual effect depends on the vehicle's electrical design and installation conditions; it does not guarantee the elimination of all voltage spikes./
Help Reduce the Auxiliary Battery's Transient Load
By participating in short-term power delivery alongside the vehicle's existing power sources, JS200H can help reduce some instantaneous demands on the 12V auxiliary battery.
This additional support may help extend the battery's replacement interval under suitable conditions. Actual results depend on battery condition, vehicle usage, electrical system design, and maintenance. JS200H cannot repair a damaged battery or guarantee a specific extension of battery life.
10-Second Emergency Assistance with Two Activation Methods· Smart app control: Connect to the device through Bluetooth using the Super Starter app and select the forced-start function.
● Smart app control: Connect to the device through Bluetooth using the Super Starter app and select the forced-start function;
● On-device control: Press and hold the forced-start button for three seconds;
Smart Bluetooth App Monitoring
● 12V auxiliary battery voltage;
● Device operating status;
● Historical operating data;
● Forced-start function;
Wide Operating Temperature Range
JS200H is designed for an operating temperature range of −40°C to 80°C (−40°F to 176°F), supporting use in a wide variety of climates.
Temperature affects charging behavior. At higher temperatures, the device may automatically reduce its charging target to protect the supercapacitors. Always install the device away from hot engine components and other heat sources.
Automatic Recharging and External Charging Options
JS200H can replenish its stored energy from the vehicle's 12V power supply when operating conditions permit. If the auxiliary battery cannot provide sufficient energy, the device can also be charged through its Type-C input using a compatible 5V/2A power adapter or power bank.
Check the green indicator or the app to confirm that the device is fully charged before using forced-start assistance. Charging time varies with the remaining energy, power supply, and temperature.
Permanently Installed for Everyday Convenience
JS200H connects to the positive and negative terminals of the compatible 12V lead-acid auxiliary battery and is secured near the battery. Once installed, it is designed to operate automatically, reducing the need to store, retrieve, and manually prepare a separate portable jump starter.
Professional automotive electrical installation is recommended. Installation must follow the product manual and the vehicle manufacturer's requirements.
SPECIFICATIONS
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Faqs
2. We respect our customers and are fully willing to grow together with them to achieve a win-win situation.
2.Small-batch trial orders are supported.
1. The customer provides the required drawings/detailed parameters.
2. The project is confirmed to be feasible.
3. A contract is signed with the customer and a deposit is paid.
4. Follow up on the customer's needs and make samples.
5. The customer tests and confirms the samples.
6. Mass production begins.
2.During the warranty period, we provide free repair and free firmware software updates.
2.If the defective rate exceeds the acceptable range based on the sampling inspection ratio, the factory shall re-produce the goods.
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2.Standard quotes are valid for 30 days, while quotes for customized products are valid for 15 days.