The Hansshow Tesla Supercharger Extension Cable Failed on Both Test Vehicles. Here's What Happened.

Non-Tesla electric vehicles have been able to charge at Tesla Superchargers for a couple of years, but V3 Supercharger cables are roughly 6 feet long and engineered for Tesla vehicles whose charge ports sit on the rear left. When another brand's charge port is positioned differently, the cable often can't reach without occupying two adjacent stalls simultaneously. Hansshow was the first company to market a NACS-to-CCS1 extension cable as a solution, and State of Charge's Tom Moloughney has now reviewed three versions of it. This latest test used the production version of the Gen 2 unit, which corrected the serious safety flaws found in the original. The production result was not what he hoped for.

The Gen 2 cable is rated for 1,000 volts, 350 amps, and a continuous 250 kW draw. The 8-foot version retails for $729, and the 5-foot version at $629 is, as Tom notes, too short to be practically useful for most vehicles. The original Gen 1 product had a critical safety flaw: pressing the NACS connector release while actively charging did not stop the charging session, creating a potential arc event when the connector was pulled. Gen 2 fixed this. Pressing either the NACS or CCS1 release button now halts the charging session before the connector can be moved. That is the minimum acceptable safety requirement, and this unit meets it. The charging performance during the stress test is a separate matter entirely.

Tom brought a Rivian R1S and a Ford F-150 Lightning, both at 15% state of charge, to his local Tesla Supercharger. Both vehicles initially drew 500 amps, above the cable's 350-amp continuous rating but representative of what high-capacity EVs pull during peak charging. The Rivian charged for 17 minutes before the session stopped and would not resume. The Lightning charged for approximately 8 minutes before the same outcome. Moving to a different Supercharger stall made no difference. Cable surface temperature throughout was within normal limits. Tom's assessment is that the NACS Tesla connector itself was likely overheating at the pin level, which triggered the Supercharger to terminate the session. Hansshow has asked for the unit back for inspection and will send a replacement. A follow-up video is planned.

Bottom line: At $729, or around $585 with the State of Charge discount code, this cable has to work reliably every session, not just occasionally. Tom's Gen 2 prototype didn't fail this way, so a faulty unit is possible. But two vehicles and two stalls producing the same outcome is not a good look for a production product. Hold off on buying until the replacement unit review is published. The problem may be unit-specific. It may not be. You need to know which before spending the money.