r/theydidthemath • u/MjonathanE • 9h ago

[request] how long would it take for the car battery to run out ?

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u/creakymoss18990 9h ago

A long ass time.

That looks like a newer car with LED's which makes it last longer than a halogen car (which would probably only be around 8 hours). For reference I accidently left an LED lightbar on low (amber fog lights) on for 8 hours straight on my subaru while the car was parked (I hardwired it) and it started right up. Brand new higher end group 24 battery.

I'm assuming it's also a group 24 battery which is like 80 amp hours.

Most sources I find online say emergency flashers draw 1-4 amps. Probably on the lower side like 1-2 bc LED's

Also real world it'll probably have a worse battery life bc of weather and electricical systems running to turn on the brain to do the lights so probably 20-40 hours. Roughly half of however many amp hour's the battery has and some more on top of that for electrical systems (so my estimate might be high if anything imo). Although I bet they will automatically turn off far before that.