Button Cell Stacker
thingiverse
Who said old button cell batteries are worthless? Just throw them away, right? Well, not so fast! Stack a bunch of them up in series and squeeze every last milli-ampere out of them - or create a high voltage DC power source. Simply stack all your (20mm) button cells +/-/+/-/etc. together in series. I filled mine half-full and got an astonishing 63V reading!
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