Pb car batteries are optimised for automotive use and the alternators are matched. car batteries have many thin lead plates that will deliver, or take, a lot of current, even when very cold or hot and the alternators can recharge the battery quickly for lots of quick starts and stops in.the coldest weather, taxi/mom, winter, chicago,christmas,school as to reprograming, not so much, automotive "charge controllers" were/are designed around Pb batteries ,which are robust beasts with a high tollerance for momentary fluctuations, and as the primary goal is durability ,they are dumb devices I live off grid, and use a variety of battery types, and voltages, so end uo reprograming regularly, and have even gone as far as to do an alternator deleet on a w250 3/4 4x4 cummins dodge ooerated at the 45'th parallel, and only the solar pannels installed on the hood for electrical power, worked with some limitations in winter, but not for the faint of heart. As soon as sodium batteries are cheap enough to play with I will be experimenting, but do expect there tobe pecuiarities to there charging cycle, and perhaps limintations on high current discharge. The test will be getting a DI diesel to start in the cold, after say forgetting to turn on the fuel for 10min, having to then boost from a Pb battery conected to a BIG regular alternator, no fires or bieng "dissabled" allowed. So the real answer is that the whole automotive sector will have to be compatable for rescue and emergency services to function, not counting just normal "hey,gimi a boost" calls costing $5000 in repairs or whatever