I bought 3 LED battens to supplement the lighting in my garage. I fitted two and one of them died in short order (Few weeks). The spare was swapped in. They were an internet purchase so I did a rough autopsy on the dead one. As mentioned before, you have cut them open to see what's gone wrong. I found a blown resistor and blown blue ceramic capacitor. I know nowt about electronics so whether they were the sole cause, or a symptom of something else going wrong, I don't know. I did get to salvage a long wide strip of aluminium out of the batten which I will probably use for Tig practice at some point.