Originally Posted by spensley
They can make them a lot smaller.
They can also make them the same size just by filling the existing/old housing with foam.
Relocate the battery to the trunk - that problem is solved - now we just need it cheaper.
Not really because the fuel tank is in the trunk, but I'm sure you can figure something out, that is if you really want a lithium starter battery. Next your going to have to engineer a special battery regulator to charge the battery, big $$$, and you might also have to redesign the alternator, more $$$.
God forbid you accidentally overcharge the lithium battery, because they burn at 2,500 - 3,000 deg F.