A BATTERY OPERATED PI ZERO IN A MINT TIN
IN PROGRESS, NOT FINISHED...
PARTS AND TOOLS
Altoids or equivalent size mint tin
18650 lithium battery
18650 battery holder with leads
battery charger/boost converter module
22 gauge steel
4 4-40 standoffs
4 4-40 bolts
rotary tool
small mounted stone for rotary tool
double back tape
silicone caulk
99% isopropyl alcohol
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PARTS SOURCES
BATTERY HOLDER MOUNTING
Tape the battery holder wires so they can't short against anything. Insert the battery into the battery holder. Clean the inside of the mint tin and the bottom of the battery holder with alcohol. Smear a thin layer of caulk on each to prime them, then put a small bead on the bottom of the battery holder. Press it into the back of the mint tin, about 2 mm away from the back wall and centered left to right. The black lead should be on the left. Press down hard enough so that the battery holder is touching the bottom of the tin - there isn't enough room in the tin to have it any higher than this. Let the caulk cure for a couple of days.
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