. . . yet again as once more, this is way above my pay grade. :oops:

When spec required 5V for LCD and 12V for Pi/CM4 board, notion was to use a PicoPSU and its AC adapter. Figured I only needed current limiting resistors for those two Pico lines.

Now I only need 12V input for both, which can be provided by PicoPSU AC adapter/resistors alone? KISS principle compliance retained.
Available hew tech 12V battery for the PowerBook 100 makes for an interesting a stretch goal for a less than simple power board.

How complicated would a custom power conditioning board need to be?

Am I better off sticking with the PicoPSU for power conditioning and tethered use only? KISS!

Requirements:

Compute Module 4 input for I/O Board
The main PSU input (J19) is a 2.1mm DC tip positive +12V input. There is an on-board +12V to +5V DC-DC converter to
power the CM4. There is also an on-board +12V to +3.3V DC-DC converter PSU which is only used for the PCIe slot. The
+12V input feeds the +12V PCIe slot, the external PSU connector and the fan connector directly. If these aren't being
used then a wider input supply is possible (+7.5V to +28V).
With a +12V supply via the DC barrel jack, the external PSU connector (J20 with +5V and +12V) is ideal to connect to
PCIe cards that require an external PSU. You should ensure that the PSUs aren't overloaded. The J20 mating connector
is known as "Berg" connector, part number AMP/TE Connectivity 171822-4 or similar.
The exact current required from the +12V PSU is dependent on the application and on what is connected to the
Raspberry Pi Compute Module 4 IO Board. We recommend budgeting 9W for CM4.
If you want to supply an external +5V supply to the board, e.g. via J20 or via PoE J9, then we recommend that L5 be
removed. Removing L5 will prevent the on-board +5V and +3.3V supplies from starting up and +5V coming out of the DC
jack socket (J19)

LCD Controller Board:
HDMI LCD Board Work for LVDS Interface LCD Screen
Input Power Adapter:12Vdc More than 2A.
Come In Standby Model When Not Input Signal
Standby Model <1W
Video Input: HDMI
OSD: Brightness Contrast Auto Language And So On
Language: English French German Spanish Italian And So On
Board Size:74mm x 53mm x 12mm

Any and all help appreciated, gang!


edit: related project thread

Looks like PowerBook 100 batteries are only 6V, so I guess the new build batteries from @360alaska are out of the picture. :confused:

Unless someone chimes in with a better idea, I'll just go ahead with current limiting resistors on a thin PicoPSU I found today for the time being. Still interested in battery packs though. Might something out of the RC/Robotics world be practical if only as a starting point? I almost never use a portable untethered so it's no biggie if battery power doesn't work out.

A dozen rechargeable AAA cells would be a PITA to use in a dedicated charger, but would fit easily into a printed case. :ROFLMAO: