VinFast Battery Degradation Calculator

Enter Calculation

Original EPA Range (km)

Degradation Rate (% per year)

Battery Age (years)

Results

Estimated Remaining Battery Capacity

87.5%

of original usable capacity

Estimated Current Range	367.5 km
Capacity Lost	12.5%
Range Lost	52.5 km

What This Calculator Does

The VinFast Battery Degradation Calculator gives you a quick estimate of how much usable capacity your VinFast EV battery has lost over time and how that affects your real-world driving range. Like all lithium-ion EV batteries, VinFast packs slowly lose capacity with age and use. This tool uses a simple linear degradation model so you can ballpark your remaining capacity and current range.

How to Use It

Enter three values: your vehicle's original EPA/WLTP rated range in kilometres, an estimated yearly degradation rate as a percentage, and the current age of the battery in years. The calculator returns your estimated remaining capacity, the capacity lost, your current range, and the range lost. Typical EV degradation rates fall between 1.5% and 3% per year, though this varies with climate, charging habits, and mileage.

The Formula Explained

Remaining capacity is calculated as 100 − (degradation rate × years). The current range is then the original range multiplied by that remaining capacity percentage divided by 100. For example, a 3% yearly rate over 4 years gives \(100 - 12 = 88\%\) remaining.

$$\text{Current Range} = \text{Original Range (km)} \times \frac{100 - \text{Degradation Rate (\%/yr)} \times \text{Age (yr)}}{100}$$

Battery capacity declines roughly linearly each year at rate r.

Worked Example

Suppose a VinFast VF 8 has an original range of 420 km, degrades at 2.5% per year, and is 5 years old. Remaining capacity = \(100 - (2.5 \times 5) = 87.5\%\). Current range = \(420 \times 87.5 \div 100 = 367.5\) km. That means about 52.5 km of range has been lost.

$$\text{Current Range} = 420 \times \frac{100 - 2.5 \times 5}{100} = 367.5 \text{ km}$$

A degraded battery delivers proportionally less driving range.

FAQ

Is this an official VinFast figure? No. This is an independent estimating tool using a linear model. Actual degradation is non-linear and depends on many factors.

Why does VinFast offer a battery warranty? Most VinFast warranties guarantee the battery stays above roughly 70% capacity for a set period, so you can compare your estimate against that threshold.

How can I slow degradation? Avoid frequent fast charging, keep charge between 20–80% for daily use, and limit exposure to extreme heat.