18650 Battery holder with reverse voltage protection

Yet another 18650 battery holder. I think I could find one good enough, the ones by enif are very popular but I worry about the plastic as a spring if it gets hot. I only use stranded wire so wrapping it as a connector would be a pain unless I tinned it I guess. But the main reason
I dove in as I could not find any that provided reverse voltage protection. I give my projects to all kinds of people and it would only be a matter of time before they would put in the battery backwards.

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