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I've not been impressed with the longevity of any NiMh things I've owned. In theory they need less management... the Roomba and Neato vacuum robots that had NiMh batteries would kill the battery in about a year regardless of how often you ran it. The lithium ion replacements people made have gone years and still haven't died yet.
That said, it seems replacing NiMH batteries might be more straightforward for a DIYer like me.
I think I read somewhere that someone was replacing weak NiMH batteries in Prii with LiFePO4, but I could be mistaken. Lithium ion batteries don't like to be charged below freezing as you pointed out.
I expect to either have access to junkyard batteries when it comes time to replace, or be able to affordably DIY a replacement.
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