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The 12v battery was never necessary. It is a safety item.
Perhaps they could get some 'take off' Takata airbags and save even more!
 

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It will be interesting to see how it works out, but I have a hunch engineers are not as dumb as some folk think. EV engineers know about the weight reduction that can be had with Li batteries over AGM. Yet, even the newest designs have them using a small AGM instead. Safety, cold temps, cost of replacement, servicing, etc, all have to be considered, and they use Lead.
 
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