Hansshow Tesla Supercharger Extension Cable Stress Test Review

Why It Matters

If the extension cable cannot reliably deliver full charging power, EV owners face longer wait times and higher costs, hindering the practicality of Tesla’s open Supercharger ecosystem.

Key Takeaways

• Handshow’s new extension cable adds safety switch to stop charging instantly.
• Cable rated 350 A; EVs draw up to 500 A, causing limits.
• Tests showed frequent power drops to 20‑70 kW despite low connector temperatures.
• Thermal sensors trigger derating, but inconsistently across different EV models.
• Reliability issues raise concerns over cost‑effectiveness for Tesla‑Supercharger users.

Summary

The video reviews Handshow’s Tesla Supercharger extension cable, a solution for non‑Tesla EVs with CCS1 ports that need longer reach at Tesla stations. After early safety concerns—specifically a live connector when the button was released—Handshow upgraded the design with a true switch and dual‑ended thermal sensors.

The tester stresses the cable on a Chevrolet Equinox EV, a Ford F‑150 Lightning, and a Rivian R1S, pulling up to 500 amps despite the cable’s 350‑amp continuous rating. Initial charging spikes to 150 kW, but both the Equinox and Lightning experience abrupt power drops to 20‑70 kW, even though connector temperatures remain well below typical thermal‑derating thresholds.

Key moments include the reviewer noting, “the button was just a button, not a switch,” and later observing, “charging stopped at 20 % then resumed at 21 kW.” Switching to a standard Knack adapter restores expected power levels, confirming the extension cable as the source of the throttling.

These findings suggest the cable’s thermal management may be overly conservative or flawed, undermining its value for drivers who must occupy two stalls and pay premium prices. Until reliability improves, EV owners may hesitate to adopt the extension, limiting broader adoption of Tesla’s open‑charging network.

Original Description

Save 20% on the Hansshow Extension cable with the "STATEOFCHARGE" coupon: https://www.hansshow.com/products/nacs-to-ccs1-adapter-supercharger-extension-cable-5-8-feet-for-tesla-supercharger-to-ccs1-charging-adapter-2-0?bg_ref=1Sdi2pZ2FQ

My first Hansshow extension cable video: https://youtu.be/KPyCww4mUZI?si=M9lD7xElSlopVu9I

My second Hansshow extension cable video: https://youtu.be/N2U-bnNo8HQ?si=EGsWSVfkQoVHmgXe

My third Hansshow extension cable video: https://youtu.be/5iivMZuhzlQ?si=3mXAtWGRiIIT1Qof

Bowe Family EV's Hansshow Extension Cable video: https://youtu.be/6JrlNzut5nQ?si=FMVtwxJlB5SBQACO

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Chapters:

00:00 Intro

07:15 Using the Hansshow cable on a Chevrolet Equinox EV

13:10 Charging a Ford F-150 Lightning with the Hansshow extension cable

17:27 Charging a Rivian R1S with the Hansshow extension cable

23:22 Reviewing the charging data

26:58 My thoughts on the Hansshow extension cable

34:05 Outro

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