this post was submitted on 11 Jul 2023
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It depends on the data that comes in, really.
All Li-ion degrades, but is it a 300k item or is it a 100k item? Even transmissions fail out on typical cars... I know, my family's old Previa had its transmission die. It was totaled, it cost more to replace the transmission than the value of the old van.
At 150k miles and a $7500 priced battery (ex: Ford Escape PHEV), this comes out to $5 per 100-miles. On top of 15-cents per kW-hr or ~$5 per 100 miles of electricity. Overall, we can see that even with just 150k miles and these assumptions, the total-costs (electricity + battery maintenance) is $10 per 100-miles. My local gasoline is $3.50, this means that your ICE needs to drive better than 35mpg (at $3.50 per gallon of fuel) to beat out these assumptions.
If the hybrid battery lasts 300k miles instead, then well... that's closer to $7.50 per 100-miles or you need to do an MPG of 46 to be competitive.
Hard to say really, but most of the math I've crunched is pretty good. The PHEV is at least within the reasonable bounds of price, even with the cost-of-battery factored in.