this post was submitted on 15 Jul 2023
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Yeah, what I've heard is that water cooling the batteries (like almost every EV does now) massively extends the life. Early Prius batteries had no cooling and the heat degraded them faster. 15 years is a pretty good life still.
On the subject of battery warranty:
It's important to note, a degraded battery, even with 50% of its original capacity is still useful. Someone who doesn't need the range could drive it, or the battery could be taken apart, and have the cells repurposed or recycled. Lithium and some of the other rare metals used in batteries are quite valuable for recycling, and our abilities to do so are getting better every year.