Mount for this USB-C Lithium charging module:
LIFC1-N (Affiliate link)

It's available in 2S, 3S, 4S and 5S. The 5S version is suitable for 18V tool batteries.
I integrated it in a Ryobi compressor to easily charge the battery without the original bulky charger.

You need 1XM2x9 screw to secure it, I also added a printable bolt, but recommend a metal screw.
The mounting frame is ideal for marking the hole and the low tolerance version will clamp the mount without any glue.