After 2+ years my Streamlight Stylus Pro died from battery leakage illness.
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STREAMLIGHT Stylus Pro 2 Year Review
My switch got fouled by battery acid too. I soaked it in a little vinegar and it was good to go.
took mine to the beach for beach camping and it did the same thing. You can take a screwdriver across the tail section hitting the battery and frame to test the light without the switch in place.
R i p streamlight