Battery
19 article(s) on «Battery». Sorted by severity — most severe first.
Model 3/Y 82 kWh Panasonic (US): frequent module imbalance
American 2021–2022 LR cars show frequent imbalances; the root cause is current leaks through the fuse-wire "fingers" of the 21700 cells. Thresholds (up to 8 mV is fine, alert at >150 mV), a breakdown of the BMS_a029/a064/a074/a079 codes from Toolbox, photos of leaking modules and every treatment option — from module repair (tsk.by's recommendation) to a swap to LG 79.
Tesla battery errors (BMS): Service Mode codes decoded, what they mean & repair cost (2026)
Full breakdown of the scary Tesla battery codes from Service Mode: BMS_a066/a064/a079 (imbalance), BMS_f107 (sense tabs), BMS_a035/a037 (moisture), BMS_f038 (contactor). What each error means, who it affects (model/year/chemistry) and what the repair costs in Belarus — with links to detailed articles.
Model S 85 kWh and pre-facelift X: stuck air valves and moisture ingress into the battery
Old Model S 85-kWh packs (and same-design 90-kWh packs in pre-facelift S/X) are prone to corrosion/leaks through valves/fuse cover → BMS errors, HV shutdown. What to look for and how to fix it.
Which battery does my Tesla have? NCA, NMC, LFP, 4680 lookup by model and year (2026)
Quick lookup table for every Tesla battery chemistry by model and year: NCA 18650 (early S/X), NCA 21700 (US M3/Y), NMC LG 79 kWh, LFP — prismatic CATL/BYD (CN/EU SR), 4680 Texas Model Y. How to check what you have via VIN and Service Mode, reliability ranking from community experience, and which packs are risky to buy used.
Used Tesla buying checklist: what to verify in 10 minutes by model and battery (2026)
Structured checklist: what to do BEFORE the viewing, the 3 software checks that take 10 minutes (ScanMyTesla, ECUVIN, our cert-risk calculator), how to inspect body / suspension / electronics in person, and the red flags for each battery chemistry (NCA/LFP/NMC/4680). Distilled from 400,000+ messages in our community.
High-voltage isolation fault: where it comes from and how the leak is found
Tesla's HV system runs at 350–800 V, and onboard monitoring watches the isolation constantly. Where current leaks to the body come from (moisture, road salt, aging, accidents), what an isolation fault threatens — from power limiting to a full no-drive lockout — and how a shop localizes the leak with a megohmmeter. Prevention tips for the Belarusian climate.
Which Tesla to buy by year: a guide to generations, batteries, and known issues (2026)
A breakdown of Model 3, Y, S and X by model year: which generation to buy, which to watch closely, and which to avoid. For each year — battery chemistry, key known issues with links to deep dives, a distinguishing feature, and a traffic-light verdict. Summary table + cross-cutting red flags (MCU1, certificates, Autopilot HW). Distilled from 400,000+ messages in the TESLA Belarus community.
Model 3/Y: HV battery module-level repair — who can do it in Belarus and what it costs
82 kWh Panasonic packs degrade in a typical pattern — one out of 16 modules weakens → imbalance → errors. Good news: a module can be replaced individually. What it costs in Belarus, who actually can do it, and when it's easier to take a refurb pack.
Battery Test — battery calibration via Service Mode
Battery Test is a BMS diagnostic and calibration: it shows the battery's real state and refreshes the capacity readout. It is not a cure for imbalance. Where and how to run it in Belarus, what charger you need, how long to wait.
Model 3/Y 79 kWh LG (Europe, NOT China): a reliable choice
LG 79 kWh (EU) shows the lowest failure rate per field reports. A good balance of longevity and charge.
Tesla Model 3/Y LFP 60–64 kWh (CATL/BYD): durably reliable, but RWD only
LFP batteries (CATL/BYD) — an excellent choice for long-term ownership: low degradation with daily 80–100% charging and simple operation. Usually fitted to RWD.
Tesla Model Y (TX, 4680): battery issues and zero repairability
Some Model Ys with the new 4680 batteries (USA, Gigafactory Texas) have shown traits that complicate battery service and repair: the structural battery pack is harder to repair, and mass production of the 4680 is facing difficulties.
Tesla Model S/X 100 kWh Plaid/Palladium: features and vulnerabilities
The ~100 kWh Palladium pack on Tesla Model S/X Plaid and Long Range (2021+ refresh): 7920 Panasonic 18650 cells, more reliable voltage sensing, but the floor is vulnerable to impacts and moisture.
Model S/X 100 kWh: voltage sense harness tab failures
On 100-kWh batteries, voltage sense harness/tab failures on modules occur → BMS errors, pack shutdown. What to do and how much it costs in Belarus.
Model S/X 90 kWh: faster degradation than 85
90-kWh packs (NCA with silicon added to the anode) per owner reports degrade faster than 85. Fewer typical 'fatal' defects.
Tesla Model S/X stuck HV contactor: BMS_f038 errors, won't sleep, won't charge — diagnosis and replacement
Sticking HV battery contactors on early 85/90 kWh packs cause BMS_f038 / BMS_f087 errors, prevent the car from sleeping (12V drains overnight), and after a charge-station pyrofuse trigger leave the car unable to drive or charge. Service Mode diagnostics, replacement procedure, and why this is one of the few HV jobs you should not DIY.
Model S/X refresh (2021+): battery sealing issues (officially acknowledged by Tesla)
Tesla has officially acknowledged a battery sealing issue: bulletin SB-25-16-002 'Replace Flood Port Plungers' (05.05.2025) — free goodwill replacement of 5 flood ports on S/X built 01.2021–22.09.2022 (US and Europe). Caveat: the bulletin covers external flooding; there are still no confirmed 'breathing' moisture-ingress cases on Palladium packs.
Model 3/Y 54 and 75 kWh (pre-facelift, before 2021): imbalance happens, but less often
The 54/75 kWh packs (pre-facelift) are generally more stable than 82 kWh, but imbalance is possible. What to look at when buying and servicing.
Tesla diagnostic software: Scan My Tesla, OBD adapter & what it shows (2026)
Scan My Tesla is the go-to Tesla diagnostic app over OBD: real battery SOH, cell imbalance, temperatures, charge power. Which adapter you need for Model 3/Y and S/X, what it costs, what to check when buying used, and the alternatives (Service Mode, TM-Spy, Aviloo).