How long you had the light Padowan? If i remember right earlier lights, well the units, had some QC issues that were rectified. Wonder if the batteries have undergone the same changes.
I've had the light a couple of months now. When it arrived I opened it up and it seemed to have the modifications that came after the original comments (thermal paste etc) so I think it's one of the updated ones.
I can't be ar$ed to send it back to DX for a replacement, I've got some Sony camcorder chargers that are the same voltage and current, designed for Li batteries so I'm going to lop off the charging cable from the burnt out charger and solder it into one of the Sony ones – added benefit is that the Sony charger has a 12VDC input so I can charge it in the car without using an inverter!