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Short answer, "Yes, you can use them until the battery dies."

Will you be driving the car? The engine will die too (probably with no warning) when the battery voltage drops too low to power the computer and/or ignition system. (Don't ask me how I know.) If the lights are on, that's going to happen sooner rather than later.

Also, you aren't doing your battery any favors. Most car batteries are so-called engine starting batteries. They are designed to be able to deliver relatively high cranking current for their size, but the tradeoff is that they are not designed to be deeply discharged. Every time you let an engine-starting battery go dead, you may be taking another few weeks-to-months off its life expectency.

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Q: Can you use the lights If a car's generator is not working?
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