another good test might be for waterproofness. but if any fail you've damaged your personal property. I too have a magicshine and battery replacement. love it. I also bought a knockoff but haven't done much with it beyond charging and testing in the house. the magicshine performed well through years of rain and I would trust it still in rain sleet snow, etc. I carried the battery in a water bottle with a waterproof cover while commuting in bad weather. now the battery rides in my rear trunk