Why won't my car start if I forgot to turn off the headlights overnight?

Артём88 RU 🌱 Newbie 👁 73 ⚑ Report Electrics

I've got a Kia Sportage 2023, left the headlights on all night. Woke up in the morning and the battery's completely dead, the starter won't turn at all. Tried charging it from a power bank through the cigarette lighter - didn't help. Is it possible something burned out in the electrical system?

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★ Best answer

I had this happen to me ages ago with one car - I left the headlights on overnight and the battery was completely dead in the morning. The thing is, a power bank just doesn't give enough amps to crank the starter, it's a totally different kind of power than what you need.

Ask your neighbor to drive over with their car and jump-start yours using jumper cables - it'll take like 5-10 minutes. If the car starts after that, then everything's fine with the electrical system, the battery's just dead and you need to drive it for a couple hours to charge it back up with the alternator.

A power bank won't help - the starter needs peak currents in the hundreds of amps, and those devices aren't designed for that. If the battery is completely drained, even charging won't get it back to working condition in a few hours, it takes time. Ask your neighbors or friends for a car with jumper cables - connect it directly to their battery for about twenty minutes, let their engine run, and then try starting yours. And here's some advice for the future: if your car has an option for automatic headlight shutoff or a reminder about them, turn it on in the settings - a lot of people don't know about it, but modern cars often have this feature.

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