they are compatible with our alternators . mine reads 14.2v when running and the pack can handle up to 16.5v.

disadvantages are weight and cost . a 12v 20ah racing battery from lithium pros (c925) weighs 7.75lbs compared to my 22ah one that weighs about 11lbs ready to drop in . in our case not a big deal but an electric car they would be hundreds of pounds heavier then other lithium's .

By far the biggest disadvantage is cost the big cells originally sold for $600/ea and these 11ah over $100 ea. a battery pack for a Tesla would be $100k plus few non commercial applications need discharge cycles in the tens of thousands . This is why they are used mostly in military and commercial applications . But if Toshiba can get the cost of theirs down you will start seeing them a lot more .