I did some work on the BD06 yesterday. Posted some info and pics of driver and thoughts in the What did you mod today thread
If you already have some 26650 batts its definitely nice light to pick up. Recent deals have been in the $19-22 range with Biscotti 12 mode.
Used the charger yesterday too. Nothing got warm or seemed odd. But I didn’t check the charge current or test the cut off voltage.