How to Check Your Tesla Battery Health: 3 Methods Explained

Every Tesla owner eventually wonders the same thing: how healthy is my battery? Whether you've noticed a slight dip in range or you're just being proactive, knowing your battery's state of health (SoH) is one of the most valuable things you can do. Here are three ways to find out — from a quick estimate to Tesla's own diagnostic.

Method 1: The Energy Screen Calculation

This is the quickest way to estimate your battery's current capacity without any special tools or waiting overnight. Your Tesla's energy screen shows two key figures: your average energy consumption (in Wh/mi or Wh/km) and your projected range. By combining these with your current state of charge percentage, you can calculate roughly how many kilowatt-hours your battery currently holds.

Step by step

Open the Energy app on your Tesla's touchscreen. Note your average energy consumption — for example, 260 Wh/mi. Note the projected range displayed on the energy graph. Check your current state of charge percentage in the top-right corner. Multiply consumption by projected range to get the energy currently in the battery. Divide by your state of charge percentage to estimate full capacity.

Compare that to your vehicle's original usable capacity. If your Model 3 Long Range started with 75 kWh usable, you've lost approximately 4% — perfectly normal. This method is fast and free, but accuracy depends on your recent driving conditions. High-speed motorway driving inflates the consumption figure, skewing the result. For the best accuracy, reset your trip meter and drive a mix of roads before calculating.

Method 2: Tesla's Built-In Battery Health Test

Tesla introduced a proper battery health diagnostic in software update 2025.8.3. This is the most accurate method available to owners without visiting a service centre. The test cycles your battery from low to high, allowing the battery management system to take precise voltage readings at different charge levels. This recalibrates the BMS and gives you a true percentage of remaining capacity.

How to run the test

Navigate to Controls > Service on your touchscreen. Scroll down and tap Battery Health. Ensure your battery is at 20% or less and the car is plugged in to an AC charger providing at least 5 kW. Start the test. The car will discharge to near-empty, then charge to 100%. The process can take up to 24 hours depending on battery size and charging speed. Check your result in the Tesla app or on the touchscreen.

Tesla considers up to 30% degradation normal within the warranty period. Because the test recalibrates the BMS, some owners report their displayed range improving slightly afterwards — not because the battery improved, but because the estimate became more accurate. Don't run this test frequently. Each cycle adds wear. Once every six months is plenty — Tesla actually restricts it to this frequency through the menu.

Method 3: The Simple Charge-to-100% Method

This is the least precise but easiest approach. Charge your Tesla to 100% and compare the displayed range to the EPA-rated range when the car was new. If your Model Y Long Range had an EPA rating of 330 miles when new and now shows 305 miles at 100%, that's approximately 7.5% degradation. The catch: Tesla's displayed range is based on a fixed efficiency assumption, not your actual driving style. Treat it as a rough indicator, not a diagnosis.

Which Method Should You Use?

For a quick sanity check, Method 1 or 3 will give you a ballpark. For real data you can trust, use Method 2. And for a fast, no-hassle estimate right now, try our calculator.