We suffered a power outage a few weeks ago (thankfully short, as you shall see). I decreed, "Lo, bring forth the lanterns I have prepared for just such a contingency, and let there be light". We got out the three I had prepared, and not a one worked! At least I had my EDC lights, so we were not stumbling around in the dark, but I was hoping for something much better.

One failure was quite perplexing. I had loaded the lantern with 4 AAA lithium batteries, which was OK according to the light's instructions. I tested the batteries after the light failed - two were dead, and two were OK. I suspect the switch contains a malfunction - it is a fancy little thing which is supposed to come on at a high level, and then gradually decline. You stop the process when the light is right for your tastes

I will have to do better next time...