Anyone know where I can find such S21 Ultra case that allows audio jack adaptor?

I don’t believe thier is any. Unlike the iPhone variants the android cases don’t have audio circuitry in thier ports

Do they make a case similar to this where instead of a battery it's a hard drive or memory card slot? Or all of them put together

I don't think so expecially not that big.

Does the charging port make android auto or apple car play not work in your car?

It will break Carplay because this isn't an Apple case. It works fine with Android Auto as long as you use a cable with a pull-up resistor for Android devices.

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ZEROLEMON Battery Case for Galaxy S21 Ultra, 8000mAh Fast Charging & Wireless Charging Supported, Ultra Power Extended Battery Charger Protective Case for Galaxy S21 Ultra 5G - Black

ZEROLEMON Battery Case for Galaxy S21 Ultra, 8000mAh Fast Charging & Wireless Charging Supported, Ultra Power Extended Battery Charger Protective Case for Galaxy S21 Ultra 5G - Black

Product ID: 273949973

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Details

Brand
ZEROLEMON
Compatible Phone Models
Samsung Galaxy
Color
black
Compatible Devices
Samsung Galaxy
Material
Polycarbonate

⚡Fast Charging

🔋8000mAh Power

🛡️360° Protection

Description

🔋 Power Up Your Day with ZeroLemon!

DATA SYNC MADE EASY - Seamlessly transfer data between your phone and computer without removing the case.
SMART COMPATIBILITY - Works flawlessly with Samsung Dex and Android Auto for a hassle-free experience.
ULTIMATE PROTECTION - Soft TPU design offers full edge protection against scratches and daily wear.
UNLEASH ALL DAY POWER - Extend your Galaxy S21 Ultra's battery life by over 110% with a robust 8000mAh capacity.
FAST WIRELESS CHARGING READY - Compatible with QC 3.0 and PD chargers for rapid power-ups, plus wireless charging support.

The ZEROLEMON Battery Case for Galaxy S21 Ultra is a high-capacity 8000mAh protective case that not only extends your phone's battery life significantly but also supports fast and wireless charging. Designed for convenience, it allows data syncing without removal and offers comprehensive protection against daily wear and tear. Compatible with Samsung Dex and Android Auto, this case is perfect for the on-the-go professional.

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