Battery Data

Tesla Battery Data Assumptions and Degradation Method

This page explains what the battery capacity assumptions in the calculator mean. Even within the same Tesla model, usable and nominal capacity can differ by model year, trim, cell supplier, and software buffer. The calculator therefore uses conservative ranges and planning values instead of one overly precise number.

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Content updated: May 7, 2026

Definitions

Usable, nominal, and calculation capacity

Nominal capacity is close to the pack's headline energy. The vehicle does not always expose all of it for driver use.
Usable capacity is closer to the energy available for driving and charging. It excludes upper and lower buffers, so it is lower than nominal.
Calculation capacity is a conservative value inside the usable range for planning. It accounts for pack supplier and production timing differences.

Reference Table

Representative battery references

This table summarizes common sections of the vehicle choices in the main calculator. The actual calculator offers more detailed year and trim selections.

Model / trim range	Nominal reference	Usable reference	Calculator interpretation
Model 3 RWD LFP, 2021-2024	about 60 kWh	about 57 kWh	Common RWD reference after LFP introduction. Vehicle guidance has priority for daily charging.
Model 3 LR AWD Highland late, 2025-2026	about 84.8 kWh	about 81-82 kWh	Separated from earlier LR packs to reflect the larger upgraded usable range.
Model Y RWD Juniper, 2025-2026	about 64 kWh	about 60 kWh	Planning value similar to the upgraded Model 3 RWD pack.
Model Y LR AWD Juniper late, 2025-2026	about 84.8 kWh	about 79-82 kWh	Early and later upgraded packs are handled separately in the calculator.
Model S / Model X Refresh, 2021-2026	about 100-105 kWh	about 95-100 kWh	Large-pack Long Range, AWD, and Plaid variants are grouped into a planning range.
Cybertruck AWD / Cyberbeast, 2024-2026	about 123-131 kWh	about 118-123 kWh	Handled as a separate family for its 816V structural battery and owner-measured range.

Degradation

How degradation enters the calculation

By default, the calculator estimates current usable capacity from vehicle age, mileage, chemistry, and performance trim. If the user enters Rated Range, the estimate is blended with the range currently displayed by the vehicle.

For higher accuracy, precision mode supports added-energy measurement, Tesla Battery Health Test Energy Retention, and Scan My Tesla values such as Nominal Full Pack and Energy Buffer to estimate current usable full pack.

Why Values Differ

Why sources disagree

The same model name can include different cell suppliers and production periods.
Nominal, usable, EPA, and WLTP-derived values often describe different things.
Vehicle software can adjust protective buffers, changing the capacity users perceive.
Owner measurements depend on temperature, start SOC, end point, and BMS calibration.

Maintenance

Maintenance principles

Calculator data is cross-checked against Korea certification data, public vehicle specifications, EV-Database-style references, Tesla Fleet API references, and owner measurements. When sources disagree, the calculator favors conservative planning values.

When a new trim or battery pack change is confirmed, the main calculator choices, this documentation, and sitemap update dates are revised together.