i would like to know more about laser flashlight diode burning out?
While LEDs can be permanently damaged by both over-current (passing more current than the devices is specified to carry) and over voltage conditions (applying a voltage exceeding the semiconductors break over limit, thereby burning a hole thru the PN junction) , it also quite possible that you simply have a bad solder connection. I've noticed this alot from the neato crap they ship from China via all these online electronics dollar stores and have fixed more of these for family and friends than I can count.
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Have you been trying a laser flashlight hack? The modifications to laser pointers which work by 'burning a component' or 'turning a screw (potentiometer)' work by increasing the current through the diode. Cheap laser pointers are quite often pushed to their limit anyway, and increasing the current more will overheat the diode and burn it out. If you're just over-running it slightly you'll probably see a progressive dimming of the light. If you give it a hefty wallop of over-current you'll see the magic smoke being released.
LD take very very little overvoltage. It is very easy for a spike to destroy them, as well as the mechanical effects Re-Design notes. You really need a well filtered current regulated circuit to drive them.
Laser diodes last much longer than regular light bulbs but they are not permanent. They can be damaged by over voltage or by impact like dropping the flashlight or using it as a hammer. Did you have one burn out? Did you check the batteries (duh). Did you try bending the pins out a little to make sure the they were making good contact in the socket? I have a light that has a plug in light like that and have to adjust the pins just right to make it work.