Any-battery LED backlight 4 laptop

Due to the war in my homeland, millions of Ukrainians are left without electricity.
I made a circuit that can be powered by any batteries and is 15% more efficient than 5/12v LED strips.
The design of the flashlight can be arbitrary, but the backlight of the keyboard was needed.
Two AA alkaline batteries will provide light for approximately 6 hours.
One AGM battery with a capacity of 7Ah, 12V will provide 100 hours of operation.