Years ago, I acquired a Gladius flashlight. I was interested in whether the strobe function was as disconcerting as claimed. It made you dizzy, nauseous and gave you an epileptic seizure.
I found the strobe did nothing to me or to the folks I tested it on. I recall folks who mounted some on targets and reportedly then fired quite competently at it.
So, I put it on a dresser table as a backup flashlight, set on the nonstrobe setting. I did find it would drain some 123 batteries over time, so I would periodically test it. Maybe once a week. So today, I test it and it is dead. OH, well - let's put in new batteries. Nothing. Nada. Zilch.
So of it goes into the box of things that no longer work but aren't worth playing with. I didn't pay for it - work did - so I'm not motivated to pursue it. It is like my Dremel tool. Hadn't use it for years - got it out of the tool box, plugged it in and nothing.
Old age, I guess - in tool years?
I suppose that will be me in a few years. Even a battery jump start won't do it.