A CR2032 Button Cell Holder
BATTERIES NOT INCLUDED
Holds a stack of up to two CR2032 in series (one seems to work ok, but two best), stacks of other thinner CR20xx Sizes such as CR2016 and CR2025 should be fine too, but at least 3.2mm total thickness would be necessary I think.
Has a switch for on/off, and two wires.
Two 2032 in series should give you about 6v, or you could use four 2016's for about 12v, although these are coin cells so that's 12v but not a lot of current.
What else can I say! The CR2032 is a popular battery size for powering electronic projects, and this holder is what you need to use them.
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