Which battery does my Tesla have? NCA, NMC, LFP, 4680 lookup by model and year (2026)

Which battery is in your Tesla — quick reference

Tesla has used several lithium-ion cell chemistries over its history, and reliability differs significantly. Knowing the chemistry is a key factor when buying a used Tesla and when planning repairs.

Chemistry deep-dive

NCA 18650 — the "humane" chemistry

Nickel-cobalt-aluminum, 18650 cell (18 × 65 mm). Used in early Model S and X.

Pros: highest specific energy → longest range; repairable (modules can be opened, individual cells swapped ~$50–200 each); standard 18650 form factor — plenty of donors; proven long-term reliability (cars with 400k+ km still drive).

Cons: degradation −15–25% by 200k km is normal; older S/X risk moisture ingress through breathing valves.

Cycle life: ~1000 full cycles to 80% SOH.

NCA 21700 82 kWh — the most problematic

Same NCA chemistry but a bigger cell (21 × 70 mm). All Model 3/Y NCA packs use 21700 cells, starting with the pre-facelift cars (2017); the most problematic variant is the 82 kWh pack on refresh Model 3/Y LR for the US market.

Main problem: frequent module imbalance. One module starts lagging → BMS throttles power → balancing or module replacement needed.

Pre-facelift M3/Y (2017–2020) have a known issue of module contact "whiskers" detaching.

Repair cost in Belarus: $1,500–7,000 depending on balancing vs. module swap.

Alternative: swap to LG 79 kWh (NMC) — more stable short-term, but see below on long-term.

NMC 811 (LG 79 kWh) — the compromise

Nickel-cobalt-manganese, 8:1:1 ratio. On refresh M3/Y LR from Shanghai (CN/EU markets) since 2021.

Pros: fewer imbalances than NCA 21700; cheaper to manufacture → cheaper to replace.

Cons: long-term reliability: per RTC data, rising internal resistance and individual cell failures become critical around ~240k km; LG modules often aren't economically repairable — short-term savings, long-term capital-loss risk.

Good "here and now" solution, especially for replacing a dead NCA 82 kWh. But if you plan to keep the car 10+ years, NCA with regular balancing is more reliable.

LFP (Lithium Iron Phosphate) — for long life

On Model 3/Y SR from Shanghai (CN, EU), and some Berlin-factory cars since May 2023. Prismatic cells from CATL and BYD (Blade).

Pros: incredible cycle life — 3000+ full cycles vs 1000 for NCA; can charge to 100% daily — Tesla officially recommends this for BMS calibration; thermally safer — essentially non-combustible; stable voltage across wide SoC — less capacity sag; cheaper to produce.

Cons: less range — real 280–320 km vs 400–480 for NCA; worse in cold — below −10°C capacity drops 20–30% (preconditioning helps); not ideal for long trips or mountainous terrain.

Best choice for urban daily driving in Brest/Minsk.

4680 — experimental "structural" battery

Huge 46 × 80 mm cells, NMC/NCA chemistry. On Model Y AWD Standard Range from Giga Texas since 2022 (Texas-built LR/Performance use 21700 cells), primary on Cybertruck.

Tesla's idea: cells mount directly into the body as a structural element → lower overall weight, simpler assembly. This is a revolution, but...

Real downsides (2026):

• Zero repairability: structural battery = pulling the pack means partially dismantling the car;
• Single cell replacement ≈ whole-pack replacement: $15,000–25,000;
• Technology is new → long-term reliability data is sparse;
• Some problems with 4680 in Texas already reported: premature SOH drop, warranty replacements.

Advice: when choosing a used Model Y between conventional battery and 4680 — take the conventional one. 4680 is a beta test on your dime.

How to identify your battery — three methods

1. By VIN — fastest

Year (10th VIN position) + factory (first 3 characters: 5YJ/7SA = US, LRW = Shanghai, XP7 = Berlin) uniquely determine the type:

• 5YJ3 + 2018-2020 → NCA 21700 (M3 US)
• 5YJ3 + 2021-2023 → NCA 21700 only LR/Performance (M3 refresh US, the problematic one); RWD/SR from late 2021 — LFP CATL
• LRW3 + 2021+ → NMC (LG) or LFP (M3 CN, more reliable)
• 7SA + 11th character A (Austin) + 2022+ → 4680 (Model Y AWD Standard Range only)

Full VIN decoder: findmyelectric.com.

2. Via Service Mode

1. MCU: Controls → Software → press and hold the model name for ~2 seconds → enter access code "service";
2. Open the Battery or HV Battery section;
3. Module configuration and cell type appear under Configuration.

3. By marking on the HV pack cover

Most reliable but requires removing the floor trim. A shop can do it in 30 minutes.

Related articles

• Module imbalance on 82 kWh Panasonic (NCA 21700) — the main problem of US M3/Y refresh
• Moisture ingress in 85 kWh S/X via valves — for older NCA 18650
• Refresh S/X (2021+) battery valves — for Palladium packs
• 4680 problems in Texas
• 12V battery brick — separate issue, don't confuse with HV

Links

• What Kind of Battery Does My Tesla Have? (FindMyElectric): https://www.findmyelectric.com/blog/what-kind-of-battery-does-my-tesla-have/
• Comparison Tesla Batteries: NCA, NMC & LFP (Shop4Tesla): https://www.shop4tesla.com/en/pages/tesla-unterschiede-der-batterie
• Tesla Plaid Battery Teardown (Lean Design): https://leandesign.com/tesla-plaid-battery-teardown/
• Tesla Model 3 LFP Battery Pack (InsideEVs): https://insideevs.com/news/542064/tesla-model3-lfp-battery-pack/

Community experience TESLA Belarus

From the TESLA owner's group BELARUS chat — analysis of 400 000 messages.

Who reported the issue: Vitali K, Shark Dark, Viktor

Who found the fix: Zverski, Alex Bor, SΞDΞK, Dzianis Balyka

Discussion in Telegram: #298551, #403809, #318579