This short article describes a flight-safe power supply for FieldOps.
Simply get these:
https://punoscho.in/product/usb-qc-pd-afc-trigger-decoy-board-module-9v/
https://punoscho.in/product/usb-qc-pd-afc-trigger-decoy-board-module-12v/
https://punoscho.in/product/usb-qc-pd-afc-trigger-decoy-board-module-15v/
https://www.mi.com/in/product/xiaomi-pocket-power-bank-pro-10000-mah-33w/ (Xiaomi Pocket Power Bank Pro 10000 33W)
OR
A 65W USB PD power bank - not needed for 5 to 10W QRP FieldOps
https://robu.in/product/black-dc5-5-mm-male-to-female-plug-extension-with-on-off-switch/
USB-C to USB-C cable (Zebronics 3A cable for 99 INR)
Total cost: < 2500 INR