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Decent.
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Prices may varyThis product ranks #19 of 19 in Jump Starter.Three above it ↓
Last reviewed June 14, 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.
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, with the community track record still thin. 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.
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.
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.
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.
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.
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, limiting confirmed real-world diesel data. For high-displacement diesels beyond 6.5L, a unit with independent verified output data is a safer choice.
LOKITHOR claims 42-month standby at a self-discharge rate of 0.69mAh. MotorVerso cites a 24-month standby figure from the manufacturer. No 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.
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.
Marketing copy from LOKITHOR, via Amazon. Not editorial.
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