How likely will upgraded car speakers affect car battery?

I want to upgrade my moms car speakers because the stock speakers are honestly horrible! She has a 1998 bmw 528i . She usually leaves the radio on with engine off a whole lot while she waits for my sister to get out of school. Long story short, will she be safe with upgraded JBL car door speakers and still listen... show more I want to upgrade my moms car speakers because the stock speakers are honestly horrible! She has a 1998 bmw 528i . She usually leaves the radio on with engine off a whole lot while she waits for my sister to get out of school. Long story short, will she be safe with upgraded JBL car door speakers and still listen to music with engine off , or will the speakers drain the battery and leave her stranded ? Thanks a lot for the help yall
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