Going to make a voltage selectable battery for portable take-anywhere tinkering. Using several old-school metal switches and some red led lights, its should be fun.
Later we will add a USB-C LIPO charging unit and convert it to Lithium rechargeable, add a solar lid trickle charger conditioner, voltage tester, and combine it with my hacked Multimeter, and add a function generator to it for some real testing fun.
Who knows we may start a new project for a Oscilloscope???