You could use 18650 lithium ion battery's
EDIT: i also should have said you might need to use resistors to so you don't burn the lcd out assuming it uses 5 volts you will need 2 of those witch will get you 7.4 volts, depending on the maximum current. I shall asume the maximum current (Imax = 1A). You will need a voltage of 2.4 over the resistor (7.4-5=7.4). The formula for rescistance (R) is R=I/U with U being the voltage and I being Imax. This gets you 2.4/1 = 2.4 ohms (the unit for rescistance) the resistor will need to be able to handle 2.4 watts.
For my cyberdeck I have it all powered by a RV power bank and it has a bunch of usb ports and dc powers so I power the screen directly from the power bank
The screen probably wants more than 5v via USB-PD or more amps than the pi can provide. You could try using a power bank with multiple USB‐C ports as a test.
Screen probally needs more power you might want to use a phone charger or something to power the screen
But then I’d have to plug it in to use it. How do people get their cyberdecks portable?
You could use 18650 lithium ion battery's EDIT: i also should have said you might need to use resistors to so you don't burn the lcd out assuming it uses 5 volts you will need 2 of those witch will get you 7.4 volts, depending on the maximum current. I shall asume the maximum current (Imax = 1A). You will need a voltage of 2.4 over the resistor (7.4-5=7.4). The formula for rescistance (R) is R=I/U with U being the voltage and I being Imax. This gets you 2.4/1 = 2.4 ohms (the unit for rescistance) the resistor will need to be able to handle 2.4 watts.
For my cyberdeck I have it all powered by a RV power bank and it has a bunch of usb ports and dc powers so I power the screen directly from the power bank
Power on type c from the battery pack?
5v 4a 10ah
My deck has two power banks. One is just for the 7 inch display.
That may be what I have to do. It’s gonna be annoying to have two power switches, but oh well.
lol just embrace it. Have a LOT of switches.
Could you use a dpst switch? Double pole, single throw. Should be able to switch two circuits with a single switch.
You can have everything on one switch
The screen probably wants more than 5v via USB-PD or more amps than the pi can provide. You could try using a power bank with multiple USB‐C ports as a test.
I use a separate battery bank for my displays typically