Tesla Model 3 Battery Health Check

Tesla Model 3 — Battery Overview

The Tesla Model 3 is the best-selling electric vehicle in the UK and one of the most common used EVs on dealer forecourts. It is available with two battery options: the Standard Range Plus (approximately 60 kWh, later reduced to around 57.5 kWh in some variants) and the Long Range (approximately 75–82 kWh, depending on production year). WLTP range spans from around 305 miles on Standard Range models to over 370 miles on Long Range variants.

Tesla uses a liquid-cooled thermal management system and, from 2021, shifted some production to LFP (lithium iron phosphate) chemistry on Standard Range models — a chemistry known for better longevity but slightly different charging characteristics.

Common Battery Concerns

The Model 3 generally holds its battery health well, but dealers should be aware of several factors:

  • High-mileage rapid charging — Vehicles used heavily on the Supercharger network may show faster degradation than those charged primarily at home on AC.
  • LFP vs NCA chemistry — Earlier Standard Range models use NCA cells; later ones use LFP. LFP batteries tolerate being charged to 100% regularly, while NCA batteries degrade faster when routinely charged above 90%. Knowing which chemistry a vehicle has matters for buyer expectations.
  • Phantom drain — Some Model 3s exhibit higher-than-expected standby energy loss, which buyers may confuse with degradation. A proper SoH test separates real degradation from software-related drain.
  • 12V battery failures — While not related to the main traction battery, 12V auxiliary battery issues are common and can affect buyer confidence.

How the AVILOO FLASH Test Works on the Model 3

The process is identical across all supported vehicles and takes around three minutes:

  1. Plug the AVILOO Box into the Model 3's OBD-2 port (located under the dashboard on the driver's side)
  2. Wait approximately three minutes while the Box reads battery data and transmits it to AVILOO's servers
  3. Receive a TÜV-certified certificate immediately — no driving required

The test runs on a stationary vehicle, so it fits seamlessly into your intake or pre-listing workflow.

What the Certificate Shows

The AVILOO certificate for a Tesla Model 3 includes:

  • State of Health (SoH) — an independently calculated percentage, not the Tesla app estimate
  • Cell-level heatmap — visual condition of individual cells, flagging any imbalances
  • Certified energy (SoCE) — remaining usable capacity in kWh
  • Range estimates — WLTP, peer-comparison, and real-world range figures
  • Benchmarking — how this specific Model 3 compares to others of the same variant, age, and mileage
  • QR code for digital verification by the buyer

With the Model 3 being the highest-volume used EV in the UK, a TÜV-certified battery certificate is a genuine differentiator on listings. Buyers expect it — 88% of used EV buyers want battery health data before committing.

Protect Your Dealership

Under the Consumer Rights Act 2015, if a battery fault appears within six months of sale, the burden of proof falls on you. A certificate issued at point of sale provides auditable evidence of battery condition, protecting your business from costly disputes averaging £6,193.

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