Tesla quietly changed the battery in the Model Y Premium Long Range Rear-Wheel-Drive variant on the European configurator in February 2026, swapping the LG-built 5M pack for an in-house 4680 "8L" pack — and Polish, US and Korean reviewers now agree the change made the car materially worse to live with on long drives (elektrowoz.pl: Tesla Model Y Premium Long Range RWD — Better to Avoid, Electrek: Tesla's 4680 battery cells are underperforming and frustrating buyers).
What Actually Changed
The pack swap is not flagged on the European configurator and the trim name did not change. From the customer's side, the visible difference shows up in the technical sheet: WLTP range on the same Premium Long Range RWD drops from 661 km to 609 km — a 52 km, roughly 8% reduction on a vehicle with the same aerodynamics, motors and weight class as the outgoing build (digitaltoday.co.kr).
| Trim | Battery pack | WLTP range | Notes |
|---|---|---|---|
| Premium LR RWD (pre-Feb 2026) | LG 5M (supplier cells) | 661 km | Smooth Supercharger curve |
| Premium LR RWD (Feb 2026 onwards) | Tesla 4680 "8L" | 609 km | Curve drops early at 31% SOC |
| Premium AWD | LG / Panasonic cells | 586 km | Unchanged for Europe |
| Performance | LG / Panasonic cells | 580 km | Unchanged for Europe |
The Charging Curve Problem
Out of Spec Roaming's bench-and-road analysis of the European 8L pack found that DC fast-charging starts derating much earlier in the session than the supplier-cell pack it replaces. Charging power begins falling away from its 155 kW peak at around 31% state of charge, well before the conventional sweet spot of 40–50%. The practical effect: a 10–80% Supercharger stop on the 4680 LR RWD takes over 35 minutes, against roughly 30 minutes on the previous pack — both already below where premium European competitors sit in 2026 (autoevolution: 4680 Cells in the Model Y LR RWD Are Five Years Behind Competition, Tesla Motors Club: 4680 comes to European Model Y).
For long-distance European routes — Berlin–Stockholm, Madrid–Barcelona, Warsaw–Vienna — those extra five minutes per stop accumulate. A typical 1,200 km route with three Supercharger stops loses roughly 15 minutes against the outgoing build.
What European Buyers Should Do Now
French and Norwegian Tesla communities reported a wave of order cancellations through April and into May 2026 as the swap became visible. Polish reviewers at Elektrowoz now explicitly recommend avoiding the Premium LR RWD specifically: they recommend either the Premium AWD (different pack, no charging penalty) or the outgoing Standard / Long Range non-Premium trims while supplier-cell inventory lasts. The advice mirrors the Out of Spec Roaming verdict that the 4680 8L pack is currently the worst battery option in the European Model Y range.
What to Do If You Already Have an Order
The configurator does not let you specify the pack. Buyers with an active order can confirm the pack by VIN once the car is allocated — VINs beginning with the new 8L code-string indicate the 4680 pack. Tesla service centres in Germany, the Netherlands and France have so far declined to swap a delivered car back to the supplier-cell pack, so the safest path for buyers who want the 661 km range and faster curve is the Premium AWD trim or a different model in the lineup until Tesla restores parity.