leagend JS200 – Battery-Free Supercapacitor Jump Starter for 12V Vehicles

Traditional jump starters are usually stored in the vehicle and must be charged, retrieved, connected, and disconnected when an emergency occurs.;leagend JS200 is designed to work differently:;Install it once and leave it on the vehicle.;No lithium battery inside.;No routine pre-charging or storage required.;Automatically monitors starting conditions.;Automatically charges its supercapacitors when needed.;Provides starting assistance when required.;Let you check battery and starter information through the app.;Help extend the vehicle battery life by reducing the heavy cranking load placed on the original battery.;Instead of waiting for a battery failure, leagend JS200 is designed to provide proactive starting support.

No. leagend JS200 uses supercapacitors instead of a chemical battery to store energy.;Supercapacitors can deliver high current quickly, recharge rapidly, and maintain performance across a wide temperature range.;Because there is no internal lithium battery, leagnd JS300 avoids the battery aging, swelling, and thermal-runaway concerns associated with lithium-based portable jump starters. Thus, leagend JS200 is much safer than those jump starters which have built-in lithium batteries.

No.;leagned JS300 is a starting-assistance device, not a replacement for the vehicle's battery. Your original battery remains responsible for powering the vehicle's electrical system and supplying energy during normal operation.;leagend JS200 works alongside the original battery and helps handle part of the high-current demand during engine cranking.

YES.;leagend JS200 is designed to reduce the high-current burden placed on the vehicle battery during engine starting.;By providing additional starting current through its supercapacitor bank, it can help reduce deep discharge and high-current stress on the original battery. Over repeated starts, this may help slow battery wear and extend its service life.;Actual battery-life improvement depends on the vehicle, battery condition, climate, and driving habits.

No routine charging is required.;Once installed, leagend JS200 automatically manages its energy. It can recharge its supercapacitors from the vehicle battery and prepare itself for the next start.;For emergency situations, leagend JS200 also supports external Type-C power input when the vehicle battery is too weak to provide sufficient charging power.

leagend JS200 is designed to work with a weak vehicle battery.;When the vehicle battery retains approximately 5V or above, leagend JS200 can use the remaining battery power to charge its supercapacitors and prepare for starting assistance.;If the battery voltage is too low to provide sufficient charging power, an external Type-C power source can be used to recharge leagend JS200 before a forced-start attempt.

Yes!;If the battery is completely dead and the leagend JS200 is fully charged, we can use its Force Start mode to start the vehicle; while if the battery is totally dead and the leagend JS200 is also fully discharged, we need to recharge the leagend JS200 first and then use its Force Start mode to start the vehicle.;leagend JS200 is designed to assist with starting—it does not repair or replace a failed battery.

After installation, leagend JS200 continuously monitors the vehicle's electrical and starting conditions.;Its intelligent control algorithm identifies the vehicle's starting process and determines when the supercapacitor bank should provide starting assistance. After the engine starts, the system automatically manages recharge and prepares for the next start.;For normal daily driving, you simply start the vehicle as usual.

Self-Learning Mode allows leagend JS200 to learn the starting characteristics of your vehicle after installation.;During the initial starting cycles, the system observes factors such as battery voltage and cranking behavior to establish a baseline for the vehicle.;As the system learns, it can make more appropriate decisions about when starting assistance is needed.

Drive Mode allows the supercapacitor bank to remain available as an additional energy buffer while the engine is running.;When enabled, leagend JS200 keeps its discharge path closed during engine operation and places the supercapacitor bank in parallel with the vehicle's 12V battery system. After the engine is switched off, the system disconnects the discharge path.;Drive Mode is designed to help buffer transient electrical loads. It is not a voltage regulator or a replacement for the vehicle's charging system.

Yes.;The companion app provides access to vehicle battery and leagend JS200 information, including:;Battery voltage;Battery state of charge;Battery status;Starter voltage and status;Starter temperature;Starting/discharge data;Starting history;Device status;Alerts and notifications;The app is designed to make the condition of your vehicle's starting system easier to understand without waiting for a starting failure.

leagend JS200 can record important starting information such as:;Starting time;Starter discharge current;Battery voltage;Discharge percentage;Starting trends;This information can help you understand how your vehicle's starting system is performing over time.

No.;Once properly installed, leagend JS200 is designed to operate automatically.;For normal starting, simply get in the vehicle and start the engine as you normally would. The system automatically detects the starting event and manages its operation.

leagend JS200 is designed for permanent onboard installation.;The basic installation involves connecting the device to the vehicle battery's positive and negative terminals and securely mounting the device in an appropriate location.;Installation should follow the included instructions and be performed in a suitable location away from excessive engine heat and moving components.;If you are not comfortable working with vehicle electrical systems, professional installation is recommended.

NO.;leagend JS200 is designed for extremely low standby power consumption.;Its average standby consumption is approximately 3mA, and the device can enter a low-power sleep state when the vehicle is not in use.;This makes it suitable for vehicles that may remain parked for extended periods, although the overall battery discharge rate will also depend on the vehicle's own electrical systems, battery condition, temperature, and parking duration.

Yes.;The supercapacitor-based design is intended for demanding temperature conditions, with an operating range of approximately -40°C to 80°C (-40°F to 176°F).;This makes leagend JS200 particularly suitable for vehicles exposed to harsh winter or high-temperature environments.

YES.;leagend JS200 contains no internal lithium battery and is designed for permanent vehicle installation.;It also incorporates multiple protection functions, including overcurrent, overvoltage, overcharge, and reverse-polarity protection.;However, proper installation is essential. The device should be securely mounted in an appropriate location and kept away from excessive engine heat, moving parts, and other unsuitable areas.

leagend JS200 is designed primarily for 12V vehicle starting systems and is intended for a wide range of passenger vehicles and SUVs.

First, check:;Whether the positive and negative connections are correct and secure.;Whether leagend JS200 has sufficient supercapacitor energy.;Whether the vehicle battery voltage is within the supported range.;Whether the vehicle is compatible with leagend JS200.;Whether the starting attempt is performed according to the instructions.;If the vehicle has a mechanically damaged engine, a severely damaged battery, or another electrical/mechanical fault, leagend JS200 cannot resolve the underlying problem.

Yes.;leagend JS200 does not prevent you from using other starting-support equipment when necessary.;In particular, an external Type-C power source can be used to recharge leagend JS200 when the vehicle battery is too deeply discharged to provide sufficient charging power.

Supercapacitors are designed for a very high number of charge/discharge cycles and are not subject to the same chemical aging mechanism as conventional rechargeable batteries.;leagend JS200 is designed for long-term onboard use with a service life of 10+ years under appropriate operating conditions.;Actual service life can vary depending on operating temperature, vehicle conditions, installation, and usage.

leagend JS200 is designed with a rugged enclosure and IP65 protection.;Nevertheless, it should be installed in a suitable location according to the installation instructions rather than being intentionally exposed to continuous water immersion or direct high-pressure water spray.

No.;leagend JS200 is designed for 12V vehicle systems.;For 24V vehicles, we would recommend to choose leagend JS600.