Welcome to the Nissan Patrol forum. To post a question and to see less adds on the forum then you will have to register
first. We are an easy going friendly forum so join in the conversations and feel free to ask any questions.
Become a forum sponsor for only $20 and see no adds with faster page loading times and many extras benefits.
Darren, just remembered my 24V mig, which is a Ready Welder 2, protects the batteries from internal arcing, hence if this was the same style of welder you used, would explain why perhaps there was no damage to the cells and your battery life remained unaffected.