Converting a Kobalt 40 Volt Charger into a 13.8 Volt Power Bank

Product Links and Details:
8/40 VDC to 13.8 Volt DC Step Down:, 10 Amp.
https://amzn.to/47EPbtW
These come in a variety of input and output ranges and amp ratings.
Note for Hams: Per the reviews, these adapters can be very noisy on UHF/VHF Frequencies.

If you don't want to sacrifice a charger, this adapter is also an option:
https://amzn.to/47Gvdif
Generic Adapter for Kobalt 40V lithium battery

Being the cheap bastard that I am, I figured I'd sacrifice one of my extra chargers instead of spending the $29 on the pre-fab adapter.

This also exist, and I bought one cuz why not:
https://amzn.to/3NcruB0
Battery Adapter for Black+Decker 20V MAX with Fuse and Switch.

If you found this video helpful, and buy stuff on Amazon anyways, then I'd appreciate you using any of the links above for your next purchase.
It will cost you nothing extra, and as an Amazon Associate, I'll earn a few cents as a commission on your purchase, even if you buy something else.