Not to rain on the parade, but definitely some details to work through...I'm sure a few have tried and till you get it all together, you won't be giving them away. LOL I have replaced cables and cells on forklift batteries with a torch. Lead sticks to clean hot lead and not much else. Not sure what they do to get it to grab the copper. Maybe flux is enough. Or maybe tin the cable ends. I could see issues with them pulling apart if you don't get the bond right. Also, on the other ends, I believe there is a bit of plastic that might be a challenge to duplicate.