The X60 (and all other Supbeam/Acebeam lights that recharge cells inside the light) have problems that the manufacturer refuses to repair. The battery charging system was poorly designed and does not balance charge the cells, resulting in excessive heat and wear on the lowest voltage cell(s) during discharge.
Also, the control ring was poorly designed. The light does not maintain a constant output setting and varies in brightness (dim, bright, dim, bright, etc). Sometimes it even goes into strobe mode all by itself. Of the three X60 flashlights I received, two of them have been returned to the manufacturer because they didn’t work properly.
I closed the X60 group buy sale and am working with several others and the Consumer Product Safety Commission in preparation of having their product lines banned for sale within the US. Acebeam is aware of this and refuses to do anything to help us.
Sales thread:
Discussion thread: Supbeam X60 Group Buy - Interest and Discussion Thread - Dangerous problem discovered!