so what your saying is the 12 volt battery is just daisy chained off of 2 of the 6 volts installed on the cart? swapping over to lithium the batteries are 48 volt each using 4 of them to make up enough AH to make the carts run time. and/or that dc-dc converter u speak of is 48v-12 and running lithium connected exactly the same way wont make a difference to the 12 volt atv battery.