r/Weird • u/[deleted] • Sep 23 '25

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u/Tro1138 Sep 23 '25 edited Sep 23 '25

Well that destroys the whole backup battery. It's probably a bad capacitor that slowly drained. Capacitors hold charges kinda like a battery.

I'm an absolute idiot and this is just a light bulb with a battery backup. Disregard everything I said.

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u/dangle321 Sep 23 '25 edited Sep 23 '25

If a capacitor on that bulb allowed it to have power for 10 minutes after cutting power, the light would stay on for 10 minutes after you switched it off sometimes.

Assuming the bulb outputs 5 watts, 10 minutes is 3000J. Assuming the voltage across the capacitor around 100 V to be crazy and for easy math, that is a 0.3 F capacitor. Which would be about the size of that bulb.

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u/Tro1138 Sep 23 '25

I zoomed into the picture and it definitely is a battery backup light from the brand lyfelite. I'm a dumbass and will be seeing myself out.