If you don't know or are not qualified, I'd highly recommend hiring one on for the calculation. Just remember free internet advise is always accurate and without fault.
You can easily 'splode a battery with a welder. Ask me how I know...
Although, it's true that "most" of the electrical current will take the path of least resistance. However the current can run through the battery connections especially if the battery's electrical path is between the stinger...
Hey MillerMav,
$40 for material and $40 for machining for one lug. Probably use USPS flat rate box to ship. Let me know, I can knock it out by early next week. Will also need your dwg file for actual dimensions. If you want more than 1 lug I can do better on T&M price.
Cheers,
Engineering