Tesla single-cell swap is possible

We were the first in the world to successfully perform a single-cell swap on an HV battery—where other claimed impossible—but can every HVB be repaired?

In reality—no, not always. The end-of-life for an HVB depends heavily on mileage, aging, cell type, C-rate, and the overall design and lifespan expectations. Repairability varies significantly depending on whether the pack uses pouch, prismatic, blade, or cylindrical cells—and whether the failure occurs early or late in its life.

If the battery fails early in its lifecycle, repairs are usually feasible. However, if it fails after reaching its intended lifespan, any repair tends to be more of a temporary “patch” until a replacement pack is sourced.

From experience for cellswap:

•Blade and some pouch cells are nearly/completely impossible to repair.

•Prismatic cells are difficult or impossible.

•Cylindrical cells are the easiest to repair—depending on the pack design.

(* module change not a topic)

Max Lifespan average:

EU Hybrid – 100,000km

EV Overdesigned cylindrical cell – 600,000km

EV Underdesigned cylindrical cell – 250,000km

EV Pouch – 10,000-200,000km (*some can more)

EV Prismatic – 100,000 – 300,000km

*performance models 30% less

Worst decision – POUCH

This is why it’s encouraging that BMW, Hyundai, Mercedes, and Porsche have finally begun adopting cylindrical cell designs, moving away from less reliable pouch cells—albeit a decade too late.

For example, a Tesla Model S 100D battery can last up to 600,000km in Model S and 450,000km in Model X. The older 85 kWh pack in the S85 can even reach 600,000 km. However, the same pack in the high-performance P85D tends to degrade around 400,000 km, requiring full replacement due to total deterioration.

In summary: Yes, battery repair is possible—but only if the pack is still within its designed service life.

And whoever designed Model 3/Y battery deserves Nobel price and we want his name at our “wall of legends”

* Disclaimer: Our first cell swap was performed three years ago and the vehicle is still running smoothly. Job done on multiple vehicles. It exceeded our expectations—we initially anticipated another cell failure within that time. If multiple cells have failed, this type of repair is no longer practical or viable.

@evclinic

Did you know that cylindrical cells are most sustainable and easiest to repair.

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