Hansshow Tesla Supercharger Extension Cable Test: Not A Great Result

Why It Matters

If extension cables cannot reliably handle peak loads, non‑Tesla owners will continue to lose charging stalls and face safety risks, slowing the adoption of open‑access Supercharger networks.

Key Takeaways

• Tesla Supercharger extensions aim to let non‑Tesla EVs use single stalls
• First‑gen Handshow cable overheated, failed to cut power on release
• Gen 2 adds safety shut‑off but still shows charging interruptions
• Stress test revealed premature shutdown after 17 minutes at high amperage
• Temperature stayed moderate, but reliability concerns limit practical adoption

Summary

The video documents a hands‑on stress test of Handshow’s second‑generation Tesla Supercharger extension cable, designed to let non‑Tesla EVs reach a Tesla V2/V3 charger without occupying two stalls.

The reviewer explains why the extension exists—Tesla’s opening of its network to CCS‑1 vehicles—and outlines the test: a Rivian R1S and a Ford F‑150 Lightning, each starting at roughly 15 % state of charge, were charged sequentially for 30 minutes each, drawing up to 500 A, well above the cable’s 350 A continuous rating.

During the run the cable’s safety switch functioned, cutting power when the button was pressed, and temperatures stayed modest—about 20 °F hotter on the Tesla side but never reaching 100 °F. However, after 17 minutes the Rivian’s session halted at 51 % SOC, prompting an early shutdown despite no overheating.

The mixed results suggest the Gen 2 unit resolves earlier safety flaws but still cannot sustain the high‑current bursts typical of modern EVs, limiting its usefulness for drivers who rely on Tesla Superchargers and raising questions about the product’s readiness for broader market adoption.

Original Description

Hansshow sent me a complimentary NACS to CCS1 8-foot extension cable for review, and the results weren't great. I witnessed multiple failures and couldn't complete a charging session longer than 17 minutes without the charger shutting off power.

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