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Doesn't lead acid have superior temperature tolerance? Might be an argument for keeping it.
When a BEV/EREV's high-voltage lithium battery pack gets so cold that it doesn't work, you can't start or drive it anyway. So it doesn't matter.

I guess it might be possible to run a "regular" hybrid even if its lithium traction battery is too cold to work, assuming that the lead-acid battery cranks the engine. But I'm not sure if that's how modern hybrids work.
 
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