The problem isn't that one method is superior to the other, but rather the need to continue a "I'm right, your wrong" discussion. I have crimped NUMEROUS battery cables over the years and have had the battery fail long before the connection corroded. This includes autos and RV's. Unless someone can post FACTS from an INDEPENDANT source, I say they are both good to go....Lets leave it there.Hold your fire boys. Cease fire.
My question is which method, crimp or solder, would have benefitted the OP more?
It sounds like even if the crimp was performed correctly when new that the corrosion resulted in the cable strands disintegrating and this resulted in the crimp no longer having a tight grip.
Would the same have occured with a solder? Would a wire strand encapsulated in solder be safe from corrosion?
OK...you can start shooting again.