I made this model for backing up RPi5's Real Time Clock (RTC).
It works with maxell's ML2032 rechargeable coin battery (https://biz.maxell.com/en/rechargeable_batteries/ml.html) and 2-pin JST-SH connector with 0.8mm cables.
Be careful of the polarity of the battery (the left-hand side of the pin is 3.3V and another is GND). In the cover image, the plus-side of the battery is connected to the black cable.
The author marked this model as their own original creation.