A little #sideProject I play with is making little #battery "surrogates" or dummy batteries. They let you debug circuit power issues or design goals, or let you make a battery-powered device into a much longer-lived device by using a larger battery or power supply.
They've been very useful for me, so I share them a bit too.
I've just recently made a #CR1632 sized one which is quite a challenge to fabricate. It's very tiny with tinier routing channels.
I share printable designs of a few, but the threading of the conductor wires is quite challenging for most, so not broadly practical.
Instead I mostly sell them on #Tindie for a couple of bucks and curse a little bit when anyone orders one.
So far I offer AA, AAA, 18650, CR2450, CR2032 and now CR1632 size too!
Tedious little things, but hey, I make about a dollar an hour when I sell a few, so I've got that going on.
Oh, here's a pic of the latest in the portfolio. The CR1632. All threaded up like a button.