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Raspberry pi Portable: One battery for screen and rasp? How? Answered

I'm trying to make a Portable Raspberry with an old laptop screen. My doubt is if I should rearrange the battery to deliver ~5V to the raspberry and use a boost converter (XL6009E1) to deliver ~9V to the LCD driver, or if I should make the battery pack deliver between 9 and 12V, and power the LCD driver directly, and use the boost converter to step down the voltage to the raspberry.
Thanks Guys ;)

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