LOKITHOR J401X Jump Starter
Priced as of May 26, 2026
4.4(129 ratings)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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CarCareTruth's Analysis
Last reviewed May 26, 2026
TL;DR No third-party certification found (no UL, ETL, or CE claim on the Amazon listing or manufacturer page as of May 2026). LiPo battery with a 10-protection BMS and genuine −40°F auto-heating hardware. The 100W USB-C PD is the standout feature at this price tier; cold-weather community data and long-term charge retention are unverified at current review volume.
What it is and how it performs
The J401X claims 2,500A peak for 12V batteries in gas vehicles up to 8.5L and diesel up to 6.5L — a label claim, not independently bench-verified. No UL, ETL, or CE certification appears on the Amazon listing or manufacturer page as of May 2026; a notable gap at $109. The auto-heating uses GREPOW Low-Temperature cells with a BMS-triggered pre-heat cycle — documented hardware, not marketing language — though independent cold-weather performance data had not accumulated at time of scoring (129 reviews). LOKITHOR claims 42-month standby; MotorVerso cites a 24-month manufacturer figure; no long-term owner corroboration exists yet. IP65 housing and 94V0 flame rating are confirmed build specs. The 100W USB-C PD charges laptops and phones at full speed and doubles as the fast-charge input, filling the unit from empty in roughly 45 minutes.
Who should buy this — and who should skip it
Best fit for drivers in cold climates who want a jump starter with genuine auto-heating hardware and a 100W USB-C output for device charging. The −40°F heating feature is unique in the CCT catalog. Skip it if a confirmed safety certification is a requirement — a unit with a verified UL or ETL listing provides documented electrical safety assurance the J401X currently lacks.
Safety and environmental impact
No third-party electrical safety certification found — no UL, ETL, or CE claim on the Amazon listing or manufacturer page as of May 2026. LiPo battery with a 10-protection BMS; no thermal-runaway incidents and no active CPSC recall in available sources. The listing carries no California Proposition 65 warning. LiPo batteries are accepted at Call2Recycle drop-off locations; no LOKITHOR take-back program is documented.
Frequently asked questions
Is the LOKITHOR J401X UL-listed or ETL-certified?▾
No third-party certification claim was found on the Amazon listing, the manufacturer product page (lokithor.net), or in the UL Product iQ database as of May 2026. The J401X is not UL-listed, ETL-listed, or CE-marked based on available sources. Some other LOKITHOR models reference UL certification on the brand website, but the J401X listing does not carry that claim. If a safety certification is a purchase requirement, check the current Amazon listing or productiq.ul.com directly — this may change as the product matures.
Does the auto-heating actually work in extreme cold?▾
The −40°F auto-heating is documented by LOKITHOR as a real hardware feature — GREPOW Low-Temperature cells combined with a BMS-triggered pre-heat function, not just a marketing label. No independent community cold-weather performance reports had been collected at time of scoring (May 2026). The auto-heating engages automatically; there is no manual trigger required.
Will the J401X start a diesel engine?▾
LOKITHOR rates the unit for diesel engines up to 6.5L. The 2,500A peak is a label claim without independent bench verification. Community review volume at time of scoring was thin (129 reviews), limiting confirmed real-world diesel data. For high-displacement diesels beyond 6.5L, a unit with independent verified output data is a safer choice.
How long does the J401X hold its charge in storage?▾
LOKITHOR claims 42-month standby at a self-discharge rate of 0.69mAh. MotorVerso cites a 24-month standby figure from the manufacturer. No verified-purchase long-term owner reports confirming retention beyond 6 months were available at time of scoring. The auto-heating BMS is documented hardware; standby duration remains a manufacturer claim pending real-world corroboration.
Is there an active CPSC recall on the LOKITHOR J401X?▾
No active CPSC recall was found for the LOKITHOR J401X as of May 2026. A search of the CPSC recall database at cpsc.gov for both 'LOKITHOR' and 'J401X' returned no results. The authoritative source is cpsc.gov/recalls — check it directly for older or resold units.
From the manufacturer
Marketing copy from LOKITHOR, via Amazon. Not editorial.
- •Powerful Performer: J401X battery jump starter has supper starting current 2500A, after full charge can achieve 60 times jump-start. Suitable for gasoline engines under 8.5 liters and diesel engines under 6.5 liters, including: Cars, Motorcycles, Boats, RVs, ATVs, SUVs, Vans, Tractors, Mowers and more.
- •-40℉ Ultra-Low Temperature Start Tech: J401X developed automatic Pre-Heating Tech based on Lithium battery management system,Start your car with ease, even in extreme cold.
- •Intelligent & Multi-Protection & Safer: Intelligent jump starter can detect the voltage of the car battery in real time and alarm for abnormal conditions. Built-in Latest Battery Management System, this emergency starter is provided with Spark-Proof Protection, Reverse-Charge Protection, Over-Charge Protection, Over-Current Protection, Short-Circuit Protection, Reverse-Polarity Protection, Low-Temp Protection, High-Temp Protection, Over-Voltage Protection and Over-Load Protection.
- •100W Two-way Fast Charging: J401X jump pack Completely input recharges in just 45 minutes, or Start your car in just 3-minutes of charge.Its internal power bank provides 100W of power output - easily powering your USB-C devices such as phones, tablets, laptops, wearables and more.
- •42-month Standby: J401X lithium ion jump starter and power pack boasts an impressive 42-month standby time, thanks to its ultra-low self-discharge rate of 0.69mAh standby power.
- •Unique Design: Rugged build enclosure rated IP65 water-resistant and 94V0 flame retardant (Rain-resistant & dust-tight, and drop resistant). Bearing extremely environment from -40°F to 140°F to ensure you can jump start under different conditions.
- •Reliable Warranty and Life-time Service Support: J401X Portable Lithium Car Battery Jump Starter Packing: Jumpstart clamps x1, 12V adapter x1, User Manual x1, USB-C to USB-C cable x1, USB-A to USB-C cable x1 and 12 months Warranty, If you need any help, please feel free to contact us.
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Manufacturer specifications
- Brand
- LOKITHOR
- Battery Cell Composition
- Lithium Polymer
- Voltage
- 12 Volts
- Product Dimensions
- 4.19"D x 9.45"W x 2.36"H
- Vehicle Service Type
- ATV, Passenger Car, RV, Tractor, Truck, UTV
- Battery Type
- Lithium Polymer
- Compatible with Vehicle Type
- ATV, Passenger Car, RV, Tractor, Truck, UTV
- Battery Capacity
- 20000 Milliamp Hours
- Amperage
- 2500 Amps
- Peak Output Current
- 2500 Amps
- Item Dimensions D x W x H
- 4.19"D x 9.45"W x 2.36"H
- Item Weight
- 1065 Grams
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Packs a punch
This jump starter packs a punch and it works in below zero temperatures. You can get several jump starts off 1 charge. I highly recommend this product.