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Sunday, May 15, 2022

5 Years of Battery Degradation Compared (Nissan LEAF vs Tesla Model X)

In this post, we'll compare the battery degradation of a 2011 Nissan LEAF LE and a 2016 Tesla Model X 90D. Why these two vehicles? Not because they are comparable in any significant way, but simply because these were my last 2 EVs and I have collected years-worth of data on each of them.

Here's the chart:

First, I want to point out that the graph is not zero-based on the left side. The bottom of the graph is 75%. This is to zoom in and see the degradation in detail, not the make it look worse than it is. 

Looking at the Leaf (blue line), you can see that it had less than 80% of the original range at the 5-year mark. The Tesla (red line), on the other hand, has more than 90% capacity when hitting the 5-year mark. The Tesla has less degradation; additionally, the rate of degradation slowed significantly after year 3. Unlike the Tesla, the Leaf's degradation showed no sign of slowing. 

At 5-years old, the Tesla had about 42,000 miles. The Leaf had a similar 44,000 miles. Working from home the last couple of years has meant fewer miles driven for the Tesla; otherwise, the Tesla would likely have about 60k miles by now.

This result is not surprising. As the Leaf aged, I wrote several posts about my disappointment with the Leaf's degradation. I'm happy to see that our Tesla has aged much more gracefully.

Disclaimer: I am long TSLA

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