Do not wish to sound condescending but, i think you may want to leave this to a professional. Melting wrenches on batteries is scary and dangerous.Please don't take offense, Robert & REnfield.In 60 or so years of working on my bikes and cars I've had far more damage done to my vehicles by dealers than by my toying with them. The last time I took a bike to a dealer the tires were installed backward and the alloy rims damaged.....no thanks.
No problem man, just had to mention it.
I'm not against dealers, when I retired from my real job I worked at dealers for a few years but not as a mechanic. If I had an RE dealer I could trust I would take it to him but unfortunately I don't. I'll figure the