Can I check Tesla battery degradation?

What is battery degradation (SoH)?

SoH (State of Health) is the ratio of current usable capacity to original capacity when new. 100% means like-new, 90% means 10% degraded.

SoH is continuously estimated by the Tesla BMS (Battery Management System) on the vehicle, but Tesla does not surface it directly on the in-car screen (some North American vehicles can view it via Service Mode).

Three ways to check Tesla battery degradation

1. Tesla app — track displayed range at 100% charge

The simplest method. Compare the "Estimated Range" shown at 100% charge against your vehicle's original EPA / WLTP rated range when new.

• Treat your vehicle's original EPA rated range as 100%
• Current 100% range ÷ original rated range × 100 ≈ approximate SoH%

This number is influenced by driving style and ambient temperature, so it's a rough indicator only.

2. Third-party diagnostic apps

Combine an OBD-II adapter with an app like Scan My Tesla to read the BMS's internal SoH value. The hardware adapter requirement makes the entry cost higher.

3. VoltKeep Pro's degradation forecasting

VoltKeep Pro estimates SoH from your charging history, driving history, and temperature history. No OBD adapter required — Tesla Fleet Telemetry data alone is enough.

• Monthly trendline of estimated SoH
• Comparison against the average for your model and year
• Forecasted future degradation based on past charging patterns (DC fast-charging ratio, deep-discharge frequency)

Tips to slow Tesla battery degradation

• Daily charging to 80–90% — save 100% for the night before a long trip (NCA/NMC batteries)
• LFP batteries (Standard Range): Tesla recommends 100% charge once a week — see official owner's manual
• Avoid running near 0% — don't repeatedly drop below 20% SoC
• Limit DC fast-charging (Supercharging) ratio — AC charge daily, Supercharge for road trips
• Avoid parking in direct summer sun — prolonged high temperatures accelerate SoH loss

Tesla battery warranty

Tesla's battery warranty applies to new vehicle purchases (used vehicles vary by configuration):

• Model 3 / Y Standard Range: 8 years or 100,000 miles (160,000 km), 70% capacity retention
• Model 3 / Y Long Range / Performance: 8 years or 120,000 miles (192,000 km), 70% capacity retention
• Model S / X: 8 years or 150,000 miles (240,000 km), 70% capacity retention

If SoH falls below 70% within the warranty period, Tesla Service will replace or repair the battery at no cost. Keeping a continuous SoH record in VoltKeep gives you supporting data when you file a warranty claim.