Touchscreen not working, is there a reason why?

You need to install the touchscreen driver from here: http://www.lcdwiki.com/4inch_HDMI_Display-C Scroll down to "How to use Raspbian/Ubuntu Mate/Kali/Retropie system"

When i first used the pi 4 screen, i connected the raspberry pie. raspberry pi 4 touchscreen flickered and didn't display. what should i do?

Make sure you read the instructions about the screen as it is not fully plug and play. It will flicker on and off a few times while being detected and there is a driver you will need to install to rotate the screen and set the resolution but it is all in the setup guide. If you did not get a setup guide, go to the website for the manufacturer and download it from there. Just be aware, this id a DIY device and setting this up may impact usability of other default monitors like it has for me.

Can I install drivers alone on my RasPi4b build without a complete new image - if so where is link?

Seller gave me instructions to install driver on an existing image within 2 hours of my email. Amazon rejects my reviews and replies if I try to post them. Be aware that there is no way to REMOVE the driver without installing a new image, also verified by seller who states they’re working on an uninstall.

I am looking at using this as a portable unit, with no power cord and battery use only. What battery would be recommended?

Miuzei raspberry pi 4-inch touchscreen power consumption is 5V 0.16A. It's recommended to use a lithium battery as power storage(NOTE: conversion between power storage and release )

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Description

👾 Elevate Your Raspberry Pi Experience!

ENHANCED COOLING - Keep your setup cool and efficient with the included 30mm case fan and heatsink.
LIFETIME WARRANTY - Invest with confidence—our lifetime warranty guarantees your satisfaction.
COMPACT POWERFUL - Experience vibrant visuals with a 4-inch IPS display that fits perfectly on any desk.
TOUCH CONTROL READY - Navigate with ease using the responsive touchscreen, compatible with popular OS like Raspbian and Ubuntu.
SEAMLESS CONNECTIVITY - Dual HDMI ports ensure effortless connections to your Raspberry Pi and other devices.

The Miuzei Raspberry Pi 4 Touchscreen is a 4-inch IPS LCD display with a resolution of 800x480, designed for seamless integration with Raspberry Pi 4 models. It features dual HDMI ports, a responsive touchscreen, and comes with a cooling fan and heatsink for optimal performance. Compatible with Raspbian, Kali, Ubuntu, and Octopi, this monitor is perfect for multimedia applications and offers a lifetime warranty for peace of mind.

Specifications

Number of Component Outputs	2
Total USB 2.0 Ports	1
Total Usb Ports	1
Total Number of HDMI Ports	2
Processor Count	1
Display Resolution Maximum	800*480 Pixels
Native Resolution	800*480
Resolution	800 x 480
Hardware Connectivity	Micro-HDMI, HDMI
Connectivity Technology	HDMI
Screen Size	4 Inches
Voltage	5 Volts
Is Electric	Yes
Viewing Angle	178 Degrees
Has Color Screen	Yes
Refresh Rate	60 Hz
Display Type	LCD
Display Technology	LCD
Aspect Ratio	16:9
Screen Finish	Flat
Warranty Type	Lifetime Warranty
Item Shape	Rectangular
Color	orange
Mount Type	Desk Mount
Compatible Devices	Raspberry Pi 4B 8GB/4GB/2GB, Orange Pi, devices with HDMI input, and systems including Kali, Raspbian, Ubuntu, and Octopi
Special Features	Touchscreen
Specific Uses For Product	Multimedia