LOKITHOR J400 Portable Jump Starter for up to 8.0L Gas & 6.0L Diesel — 2000A Peak, 5.75-inch Display

Compact yet powerful, the J400 combines heavy-duty starting power with intelligent safety systems and everyday utility features. It pairs high-rate 80C lithium cells with ConnectMax technology and an advanced battery management system (BMS) so you can revive a dead battery quickly while minimizing user risk. Beyond vehicle starts, the unit includes fast USB charging, a bright 300-lumen LED flashlight with SOS, and a large 5.75-inch display that keeps status information readable at a glance.

How does the J400 jump-start fully drained batteries?

The J400 uses a 2000A peak current and high-rate lithium cells engineered for fast energy delivery to wake even fully depleted batteries. Intelligent clamps and ConnectMax technology detect and optimize the connection to deliver reliable cranking power without repeated guesswork.

• Up to 2000A peak output for strong initial cranking.
• Supports up to 8.0L gas and 6.0L diesel engines.
• Approximately 25 starts per full charge for repeated use.
• ConnectMax automatic adjustment reduces failed starts.

What safety features protect me and my vehicle?

The J400 integrates a multi-layered BMS and smart clamp protections to prevent common hazards like reverse polarity, short circuits, and overcurrent events. These protections are designed to keep both the user and the vehicle electronics safe during a jump-start attempt.

• Smart clamps with polarity detection and fail-safe cutoffs.
• Built-in BMS monitors voltage, current, and temperature.
• Automatic shutoff on unsafe conditions to prevent damage.
• Clear on-screen alerts via the large 5.75" display.

Can the J400 charge devices and help in roadside emergencies?

Yes. The device doubles as a power bank with fast USB outputs for phones, tablets, and other accessories. A 300-lumen LED flashlight with steady, strobe, and SOS modes gives you visibility and signaling capability when working at night or alerting others to your location.

• Fast USB ports for quick device recharging.
• 300-lumen LED with SOS and strobe for emergency signaling.
• Large display shows remaining battery and connection status.
• Compact design fits glove compartments or emergency kits.

What makes the display and user interface helpful?

The oversized 5.75-inch screen provides immediate feedback on battery level, connection quality, and any system alerts—removing guesswork during stressful situations. Clear icons and real-time readouts let you confirm readiness before attempting a start.

• Large, easy-to-read status display for quick checks.
• Real-time connection and battery diagnostics.
• Visual alerts for polarity, faults, or low charge.
• User-friendly layout for rapid, confident operation.

Who is this for? The LOKITHOR J400 is aimed at drivers who want a dependable, portable solution for unexpected battery failure—commuters, long-distance travelers, weekend DIYers, and fleet users. It’s also well suited for anyone who values a compact power bank with robust safety features and a bright emergency light. Backed by a 12-month warranty and designed for quick gifting, the J400 serves both practical daily needs and peace-of-mind preparedness in roadside situations.