Running my MacBook pro off one of my DeWalt power tool batteries. There are USB-C adapters for most major tool battery brands out there, many of which (like this one) will both power devices and charge the tool battery from a standard USB-C power plug. YMMV in terms of quality/safety (this is the official dewalt adapter which works great).
Great for power redundancy, etc. A no brainer if you already have the batteries for tools.
@ethanschoonover planning on using knockoff dewalt adapters for my whole power system I am building at my land! I want the whole thing to be modular and I think that would be the most useful plug
@liaizon @ethanschoonover i do the same but with ryobi. i think it's better to use the 12-24V-input automotive usb-c PD supplies like so:
https://www.amazon.com/Baseus-Charger-Charging-Display-Compatible/dp/B0B6FYGYQD
most of these will take the 14-19V that tool batteries supply, so you just need a tool battery female socket to cigarette lighter adapter.
@sneak @liaizon If you go that route, I recommend looking into SAE to USB adapters. Easier to wire in. I have one to hand wired up with anderson powerpoles.
The advantage of the mfgr adapter in this case (and a lot of third party adapters for the tool batteries) is that they charge the tool battery from a USB source as well. Most automotive power supplies (or SAE supplies) will not.
(searching for "SAE to USB-C PD" should find a bunch of options similar to the one pictured)