A close call, my car battery failed like a champion 2 days ago. My car battery developed an internal fault which caused it to "arc". The battery lost all power instantly and burned a small section of the battery cover (carpet cover in boot). Needless to say it was still under guarantee from the parts supplier (has there logos all over it) and less than 18months old. The computer (theirs) showed that I purchased it within the last 18months but as I had lost the invoice they would not replace it. I've never come across this problem before, but luckily it caused no damage. So in summary I would never buy a "car parts wholesalers" own version of a branded battery ever again, even if they are made by the same people using the same processes as the equivalent more expensive "branded" ones. This could have resulted in a major fire inside the boot. I count myself very lucky. Failure was caused by a loose Positive Post (the one which is on the battery itself). It was wobbling when moved by hand.