Reverse battery protection for AA Flexing battery holder by enif
thingiverse
This is a surprisingly simple yet highly effective method for creating reverse battery-protected [enifs Flexing battery holders with integrated spring](https://www.thingiverse.com/thing:456900). You can eliminate diode input protection altogether by simply preventing users from inserting batteries in the wrong direction! It's just a thin shim that you insert into the minus-side of the AA-type holder and secure with a small dab of glue. 1.6 to 1.8mm thickness works perfectly, but it depends on the material (wire, copper foil, etc.) used for your contacts.
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